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Advanced Placement

AP US History

Topic 9.6: Challenges of the 21st Century

Updated · For the May 2027 AP exam

AP US History Topic 9.6: Challenges of the 21st Century is about the attacks of September 11, 2001, the wars that followed, and the economic and energy crises of the next decade. Al-Qaeda's attacks killed 2,977 people; Congress authorized force, and the Senate passed the USA PATRIOT Act 98 to 1. The United States began a war in Afghanistan in October 2001 and invaded Iraq in March 2003. After Lehman Brothers failed in September 2008, unemployment reached 10 percent in October 2009. Oil prices, Hurricane Katrina and climate policy also shaped these years, and Americans argued over safety and liberty, war, oil and money.

98 to 1 September 11, the War on Terror, Oil, and the Superpower's New Century, 2001–2010s

Controllers ordered every civilian airplane over the country to land on the morning of September 11, 2001, and the northeastern sky went empty. That October the Senate voted 98 to 1 for a statute that widened federal surveillance.

Coming soon

Challenges of the 21st Century in two minutes

  • On September 11, 2001, al-Qaeda hijackers killed 2,977 people in New York, at the Pentagon and in Pennsylvania. On September 14 Congress authorized force, with the House voting 420 to 1.
  • The United States began bombing Afghanistan in October 2001 after the Taliban refused to surrender Osama bin Laden. Kabul fell in November, but the Taliban regrouped, and the war lasted until 2021.
  • The USA PATRIOT Act passed the Senate 98 to 1, and Congress created the Department of Homeland Security. Critics challenged detentions at Guantánamo Bay, enhanced interrogation and bulk collection of phone records.
  • The Bush Doctrine claimed a right to strike first. Citing suspected weapons of mass destruction, the United States invaded Iraq in March 2003. No stockpiles were found, and an insurgency followed.
  • Subprime lending and a housing bubble led to Lehman Brothers' failure in September 2008. Congress passed the $700 billion TARP bailout, and Obama signed a $787 billion stimulus and the Dodd-Frank Act.
  • Energy and climate became national issues. Hurricane Katrina struck in 2005, oil reached $147 a barrel in July 2008, and fracking made the United States the top crude oil producer by 2018.
  • On the exam: Expect causation on 9/11 and the Iraq War, continuity and change in wartime civil liberties compared with earlier wars, and the causes and effects of the 2008 financial crisis.

Topic 9.6 key terms

al-Qaeda

Arabic for the base. A militant network led by Osama bin Laden. It carried out the attacks of September 11, 2001.

September 11 attacks

Coordinated attacks on the morning of September 11, 2001, by nineteen al-Qaeda hijackers in four airliners. They struck the World Trade Center and the Pentagon. A fourth plane crashed in Pennsylvania. 2,977 people were killed.

Civil liberties

Protections for privacy, speech, and freedom from unreasonable search. After September 11, new powers at home started a long argument over security and those rights.

Osama bin Laden

Leader of al-Qaeda, and a son of a wealthy Saudi construction family. He declared war on the United States, naming U.S. troops in Saudi Arabia, U.S. support for Israel, and sanctions on Iraq.

Asymmetric warfare

A small group using surprise and cheap weapons against a far stronger power.

Taliban

The religious movement that ruled most of Afghanistan from 1996 to 2001, and gave Osama bin Laden a base.

AUMF

Authorization for Use of Military Force. Passed September 14, 2001. Congress let the president use all necessary and appropriate force against those who planned the September 11 attacks, or harbored them.

war on terror

Bush's name for a worldwide campaign against al-Qaeda and those who sheltered it. He used it in his address to Congress on September 20, 2001.

Article 5

NATO's promise that an armed attack on one member is an attack on all of them. On September 12, 2001, the allies agreed to invoke it for the first time if the attacks had come from abroad. They confirmed that on October 2. The October 7 strikes were American and British.

Northern Alliance

Afghan forces, strongest in the northeast, who had fought the Taliban through the late 1990s. In the fall of 2001 they advanced with American bombing and took the cities, Kabul among them.

Operation Enduring Freedom

The U.S. name for the war in Afghanistan that began on October 7, 2001. The aims were to destroy al-Qaeda and to drive the Taliban from power. The fighting continued, under later names, until 2021.

Hamid Karzai

The Afghan leader the United States backed to head a new government after the Taliban left Kabul. He took office on December 22, 2001.

Hate crime

A crime motivated by bias against a person's race, religion, ethnicity, or national origin. In the FBI's count, anti-Islamic incidents went from 28 in 2000 to 481 in 2001.

Islamophobia

Fear and hostility directed at Muslims, or at people taken to be Muslim. After September 11 that reached Sikhs, Arabs, and South Asians too.

Racial profiling

Picking out a person for extra checking because of race, religion, or appearance, rather than evidence about that person.

Executive Order 9066

Franklin Roosevelt's order of February 19, 1942, used to force about 120,000 Japanese Americans, most of them citizens, from the West Coast into government camps.

USA PATRIOT Act

The 2001 law, Public Law 107-56, that widened surveillance and let criminal and intelligence investigators share what they knew. The Senate passed it 98–1. One section was later used to collect Americans' phone records in bulk.

Department of Homeland Security

A cabinet department created in 2002 by combining 22 agencies, about 170,000 employees, including the Secret Service, the Coast Guard, and customs. The FBI and the CIA were left out.

Guantánamo

The U.S. naval base in Cuba where the military held men captured in the war on terror, about 780 since January 2002, many of them without charges and outside the criminal courts.

Habeas corpus

The right to ask a federal court whether your imprisonment is lawful. In Boumediene v. Bush (2008) the Supreme Court held that Guantánamo detainees have that right.

Bush Doctrine

The claim, in the September 2002 National Security Strategy, that the United States may strike first, before an enemy attacks, if it judges the threat is forming. Bush argued that Cold War containment was not enough against terrorists and against states seeking the worst weapons.

weapons of mass destruction

Nuclear, chemical, or biological weapons. Often shortened to WMD. Before the 2003 invasion, the public case was that Iraq still had chemical or biological weapons, or was close to a nuclear one. The search after the invasion found no stockpiles.

Operation Iraqi Freedom

The U.S. name for the war that began with the invasion of Iraq on March 19, 2003. British, Australian, and Polish forces took part in the invasion. Baghdad fell on April 9. The fighting went on for years after that.

surge

President Bush's January 2007 decision to send more American troops to Iraq to cut the sectarian killing. The speech pledged more than 20,000. With support units, the added force came to about 30,000. By late 2008, deaths in Iraq had fallen.

ISIS

The Islamic State of Iraq and Syria, also called ISIL. It grew out of the Iraq war, and in 2014 it seized Mosul and a wide stretch of Iraq and Syria. The United States answered that summer with airstrikes, and later with trainers.

subprime mortgage

A home loan to a borrower with weaker credit, usually at a higher rate that can rise later. In these years many required no money down, and some never checked the borrower's income.

securitization

Banks pool thousands of loans into one bond, slice it so the top slices are paid first, and sell the slices to investors. The risk moves off the original lender's books.

TARP

Troubled Asset Relief Program. The 2008 law that let the Treasury use up to $700 billion to steady banks and, later, carmakers.

Great Recession

The sharp downturn after the 2008 financial crisis, the worst since the Great Depression. Unemployment hit 10 percent in October 2009. The National Bureau of Economic Research dates the recession from December 2007 to June 2009.

Dodd-Frank Act

The 2010 law that tightened rules on banks and created the Consumer Financial Protection Bureau to oversee mortgages, credit cards, and other loans to households. It was written to prevent another bailout of firms called too big to fail.

Hurricane Katrina

The August 2005 hurricane that flooded New Orleans after the levees failed. More than 1,800 people died. Most of those who could not leave were poor and Black, and federal help was slow.

Kyoto Protocol

A 1997 treaty to cut greenhouse gases. It set targets for developed countries and not for China or India. The United States signed it and never ratified it. Bush rejected it in 2001. Textbooks also call it the Kyoto Accord.

Hydraulic fracturing

Drilling sideways into shale and cracking the rock with high-pressure fluid, to release oil and gas. People call it fracking.

Paris Agreement

The 2015 climate agreement. Each country sets its own plan to cut greenhouse gases. The United States joined, later left, rejoined, and left again in January 2026.

flight to safety

When a panic hits, investors sell risky assets and buy the safest ones they can find. In late 2008 that meant U.S. Treasury bills, and the yield fell to zero.

superpower

A country with the leading economy and the leading military. In 2010 the United States still had both: the largest economy, and more military spending than the next ten countries combined.

American exceptionalism

The claim that the United States is unlike other nations and has a special duty to lead. The course uses Condoleezza Rice's 2012 convention speech as the example. She told the delegates America could not be reluctant to lead.

2001 AUMF

Public Law 107-40, passed in September 2001. Sixty words, and no end date. It lets the president use force against those he finds were behind the September 11 attacks, or who harbored them. Presidents of both parties have relied on it since.

Transcript

Quotes are from the historical record and name their source. Lines marked Dramatized are reconstructions.

Severe Clear

September 11, 2001

Key terms: al-Qaeda, September 11 attacks, Civil liberties

Tuesday, September 11, 2001. Pilots have a name for a morning like this: severe clear.

At nine forty-two, the FAA ordered every plane in American skies to land at the nearest airport. No one had ever given that order. The manager was on his first day in the job.

Flights over the Atlantic turned for Canada. Gander, Newfoundland, a town of about 10,000, took in 38 airliners.

By early afternoon, only military jets were flying.

2,977

That morning, nineteen hijackers from a group called al-Qaeda had killed twenty-nine seventy-seven people.

Six weeks later, the Senate voted ninety-eight to one to give the government new powers. Americans rarely agree like that. How long could ninety-eight to one last?

Blinking Red

1993–2001

Key terms: Al-Qaeda, Osama bin Laden, Asymmetric warfare, Taliban

Al-Qaeda means "the base." Its leader, Osama bin Laden, came from a rich Saudi family.

He declared war on America and named his reasons. American troops had stayed in Saudi Arabia, home of Islam's holiest cities, after the Gulf War. America backed Israel. And sanctions were squeezing Iraq.

In 1993, a truck bomb under the World Trade Center killed six people. In 1998, al-Qaeda bombed two American embassies in East Africa and killed 224.

In 2000, two men in a small boat blew a hole in the destroyer USS Cole. Seventeen sailors died.

Afghanistan's rulers, the Taliban, gave bin Laden a base. Thousands trained in his camps.

By summer 2001, the CIA's director said later, "the system was blinking red."

The Clerk

Bin Ladin Determined To Strike in US

Central Intelligence Agency, President's Daily Brief: 'Bin Ladin Determined To Strike in US' (declassified April 10, 2004), 2001-08-06

That headline reached the president on August 6. It gave no date and no target.

The CIA and the FBI each held pieces of the plot. Neither put them together.

The Clerk

The most important failure was one of imagination.

National Commission on Terrorist Attacks Upon the United States, The 9/11 Commission Report, ch. 8 ('The System Was Blinking Red') and ch. 11 ('Foresight—and Hindsight'), 2004-07-22

Tuesday

September 11–20, 2001

Key terms: September 11 attacks, AUMF, war on terror

Nineteen men hijacked four airliners. All four were bound for California, heavy with fuel.

At eight forty-six and nine oh three, two struck the World Trade Center. At nine thirty-seven, a third hit the Pentagon.

On United 93, passengers and crew learned by phone what had happened.

The Clerk

According to one call, they voted on whether to rush the terrorists in an attempt to retake the plane.

National Commission on Terrorist Attacks Upon the United States, The 9/11 Commission Report, ch. 1: United 93 (the passengers' vote), 2004-07-22

The Clerk

They decided, and acted.

National Commission on Terrorist Attacks Upon the United States, The 9/11 Commission Report, ch. 1: United 93 (the passengers' vote), 2004-07-22

At ten oh three, United 93 crashed in a Pennsylvania field, about twenty minutes' flying time from Washington. Everyone aboard died.

Jason M. Dahl LeRoy Homer Lorraine G. Bay Sandy Waugh Bradshaw Wanda Anita Green CeeCee Ross Lyles Deborah Jacobs Welsh

Twenty-nine seventy-seven people were killed. Twenty-seven fifty-three in New York, a hundred eighty-four at the Pentagon, and forty on Flight 93. Three hundred forty-three of them were New York firefighters.

Tugboats, ferries and fishing boats carried about half a million people off lower Manhattan.

On September 14, Congress let the president use "all necessary and appropriate force." The Senate voted ninety-eight to zero.

The House voted four hundred twenty to one. Barbara Lee of California voted no.

As we act, let us not become the evil that we deplore.

Rep. Barbara Lee, Floor statement on H.J.Res. 64 (Authorization for Use of Military Force), Congressional Record, 2001-09-14

She was quoting a minister she had heard that day. Death threats followed.

On September 20, President Bush addressed Congress.

Every nation, in every region, now has a decision to make.

George W. Bush, Address to a Joint Session of Congress and the American People (CED optional source), 2001-09-20

Either you are with us, or you are with the terrorists.

George W. Bush, Address to a Joint Session of Congress and the American People (CED optional source), 2001-09-20

Horse Soldiers

October 2001–2002

Key terms: Article 5, Northern Alliance, Operation Enduring Freedom, Hamid Karzai

The Taliban refused to hand over bin Laden. On October 7, American and British forces began bombing Afghanistan.

Small teams of Green Berets and CIA officers rode in on horseback, beside Afghan fighters of the Northern Alliance. From the saddle, they called in bombers by radio.

Kabul fell on November 13, five weeks after the bombing began.

In December, American and Afghan forces cornered bin Laden in the mountains of Tora Bora. He slipped into Pakistan.

In March 2002, girls in Kabul went back to school. The Taliban had kept them out for five years. But the Taliban regrouped across the border. This war would last almost twenty years.

Neighbors

September–November 2001

Key terms: Hate crime, Islamophobia, Civil liberties, Racial profiling, Executive Order 9066

On September 15, Balbir Singh Sodhi was planting flowers outside his gas station in Mesa. Sodhi was a Sikh from India, not a Muslim. His killer picked him out by his turban and beard.

Two days later, President Bush visited this mosque in Washington.

The face of terror is not the true faith of Islam. That's not what Islam is all about. Islam is peace.

George W. Bush, Remarks at the Islamic Center of Washington ('Islam is peace'), 2001-09-17

Maryam Qudrat Aseel, an Afghan American born in Los Angeles, wrote a book about being both at once.

In two months, the government detained more than twelve hundred people, most of them Muslim immigrants. The government held seven hundred sixty-two on immigration charges. None was charged with helping the hijackers.

Transportation Secretary Norman Mineta told airlines not to profile passengers by race or religion. He knew the cost. In 1942, when he was ten, the government had sent his family to this camp.

98 to 1

October 2001–2015

Key terms: USA PATRIOT Act, Department of Homeland Security, Guantánamo, Habeas corpus

Washington was still opening its mail.

On October 15, an intern opened an anthrax letter in Senator Daschle's office. Letters like it killed five people. The Senate's biggest office building closed for three months.

Ten days later, a bill reached the Senate with a very long name.

The Clerk

Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism.

U.S. Congress, Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism (USA PATRIOT) Act, Public Law 107-56, 115 Stat. 272 (Secs. 102, 203, 206, 213, 215, 218, 224), 2001-10-26

Now take the first letters.

Senators had the final text for about two days. The roll call is this afternoon.

The Senate passed it 98 to 1. President Bush signed it the next day.

The one no, Russ Feingold of Wisconsin, had voted for the Afghanistan war.

Sen. Russ Feingold

We will lose that war without firing a shot if we sacrifice the liberties of the American people.

Sen. Russ Feingold, Statement on the Anti-Terrorism Bill, Congressional Record vol. 147, no. 144, p. S11019 (CED optional source), 2001-10-25

Congress built a Department of Homeland Security from twenty-two agencies. Airport screeners became federal workers.

At Guantánamo Bay the military held captured suspects without charges, outside American courts. The CIA's "enhanced interrogation" included waterboarding. Critics called it torture. Defenders said it saved lives.

In 2013, leaked documents showed the government had used Section 215 to collect Americans' phone records in bulk. In 2015, Congress ended that program.

The FBI later concluded the anthrax letters came from an American scientist at an Army lab. In October 2001, nobody knew.

The Axis

2002–2011

Key terms: Bush Doctrine, weapons of mass destruction, Operation Iraqi Freedom, surge, ISIS

In January 2002, President Bush called Iraq, Iran, and North Korea an axis of evil. That fall, the National Security Strategy claimed the right to strike first.

Saddam Hussein had invaded Iran and Kuwait, and in 1988 he gassed Iraqi Kurds. Most Western spy agencies believed he still hid chemical or biological weapons.

In October 2002, the Senate voted 77 to 23 to authorize war. The House voted 296 to 133. Twenty-nine of fifty Senate Democrats voted yes.

On February 5, 2003, Colin Powell took the case to the Security Council.

My colleagues, every statement I make today is backed up by sources, solid sources.

Colin L. Powell, Secretary of State, Remarks to the United Nations Security Council, 2003-02-05

The Iraq Survey Group found no stockpiles, though Saddam had hoped to rebuild. Powell's speech is weak evidence about Iraq's weapons, and strong evidence of how the case for war was made.

On February 15, millions around the world marched against the war. Most Americans supported the war.

The invasion of Iraq began on March 19. Baghdad fell on April 9, three weeks later.

On May 1, Bush declared major combat over, under a banner that read Mission Accomplished. More than nine in ten American deaths in Iraq came after that day.

An insurgency grew, then a civil war between Sunni and Shia Iraqis. Millions fled their homes.

In 2004, photographs from Abu Ghraib showed American soldiers abusing Iraqi prisoners. We won't show them.

The Clerk

Numerous incidents of sadistic, blatant, and wanton criminal abuses.

Maj. Gen. Antonio M. Taguba, U.S. Army, Article 15-6 Investigation of the 800th Military Police Brigade (the Taguba Report), findings, 2004-03

In January 2007, Bush sent about 30,000 more troops, and violence fell. The last American troops left in December 2011.

Nearly 7,000 American troops died in Iraq and Afghanistan. Estimates of Iraqi dead run from over 100,000 to several hundred thousand, depending on how researchers count.

On May 2, 2011, Navy SEALs killed Osama bin Laden in Pakistan.

Too Big to Fail

2006–2011

Key terms: subprime mortgage, securitization, TARP, Great Recession, Dodd-Frank Act

While the wars went on, American house prices rose about eighty-five percent. In Stockton, they rose faster.

New subdivisions spread over the farmland at the edge of town. Loans came with nothing down, sometimes with no proof of income.

Every loan on this street would be sold, and sold again. Follow one.

On September 15, 2008, Lehman Brothers went bankrupt. It was the largest bankruptcy in American history.

Paulson asked Congress for seven hundred billion dollars. The first draft was three pages.

The Clerk

may not be reviewed by any court of law or any administrative agency.

U.S. Department of the Treasury (Henry M. Paulson Jr.), Legislative Proposal for Treasury Authority to Purchase Mortgage-Related Assets (three-page draft, Sec. 8), 2008-09-20

This time, the House said no, two hundred five to two hundred twenty-eight. That afternoon the Dow fell seven hundred seventy-seven points.

Four days later, a new version passed. It ran past four hundred pages, and cut taxes on wooden arrows made for children.

By October 2009, unemployment hit ten percent.

In Stockton, whole streets went into foreclosure. Mosquito crews searched for pools gone green, some from the air.

From 2005 to 2009, the typical Hispanic household lost about two-thirds of its wealth. The typical Black household lost more than half, the typical white household a sixth.

Voters elected Barack Obama, the first African American president. A stimulus of seven hundred eighty-seven billion dollars followed.

The Tea Party, named for Boston in seventeen seventy-three, fought bailouts and big government. Occupy Wall Street fought the banks with a sign: we are the ninety-nine percent.

Dodd-Frank tightened bank rules and set up a bureau for borrowers. Some said it went too far. Others said the banks were still too big to fail.

The Clerk

We conclude this financial crisis was avoidable.

Financial Crisis Inquiry Commission, The Financial Crisis Inquiry Report, Conclusions, 2011-01

Addicted to Oil

1997–2018

Key terms: Hurricane Katrina, Kyoto Protocol, Hydraulic fracturing, Paris Agreement

The wars were fought in the region with about half the world's known oil. In 2005, America imported about 60 percent of its oil. Canada sold the most. Oil has one world price. Trouble in the Gulf showed up at every American pump.

America is addicted to oil, which is often imported from unstable parts of the world.

George W. Bush, State of the Union Address ('America is addicted to oil'), 2006-01-31

The speaker was a former Texas oilman.

In August 2005, Hurricane Katrina flooded New Orleans. More than 1,800 people died. Those who couldn't get out were mostly poor, and mostly Black. Federal help took days. It also shut Gulf refineries, and the price of gas jumped.

In July 2008, oil hit 147 dollars a barrel. Gas passed four dollars a gallon.

The Clerk

Warming of the climate system is unequivocal.

Intergovernmental Panel on Climate Change, Working Group I, Climate Change 2007: The Physical Science Basis, Summary for Policymakers, 2007-02-02

Scientists warned that burning oil, gas, and coal was heating the planet. In 1997, the Senate voted 95 to 0 against a treaty that excused China and India.

Then drillers learned to crack oil and gas out of shale rock: fracking.

By 2014, the oil fields of North Dakota glowed from space like a city that wasn't there.

By 2018, the United States pumped more crude oil than any other country on earth.

In 2015, the United States joined the Paris climate agreement. Later presidents left it, rejoined it, and left it again.

Full Sky

2008–2021

Key terms: flight to safety, superpower, American exceptionalism, 2001 AUMF

Here's the strange part. The crash started in America. Scared investors everywhere bought U.S. Treasury bills. Some briefly paid the Treasury to hold their money.

In 2010, America's economy was still the world's largest, more than twice China's. America spent more on its military than the next ten countries combined.

This is a book not about the decline of America but rather about the rise of everyone else.

Fareed Zakaria, The Post-American World (opening sentence), 2008

We cannot be reluctant to lead, and one cannot lead from behind.

Condoleezza Rice, Address at the Republican National Convention, Tampa (CED optional source), 2012-08-29

The war in Afghanistan ended in August 2021, with the Taliban back in power.

The sixty-word force authorization of 2001 is still law. Presidents of both parties have used it.

Ninety-eight to one lasted a few weeks. After it came argument, over safety and freedom, war, oil and money.

Ten years after the ground stop, the sky was full again. The United States was still the most powerful nation on earth, still arguing about what that power was for.

Unit 9 review 1980–Present

  1. 9.1 Contextualizing Period 9 Morning Again
  2. 9.2 Reagan and Conservatism Morning Again
  3. 9.3 The End of the Cold War Trust, but Verify
  4. 9.4 A Changing Economy Help Wanted
  5. 9.5 Migration and Immigration in the 1990s and 2000s Help Wanted
  6. 9.6 Challenges of the 21st Century 98 to 1
  7. 9.7 Causation in Period 9 Out of Many

All of AP US History