U.S. Interior Secretary Deb Haaland speaking out of doors.

After 9/11: 5 Cultural Moments That Helped Americans Move Forward

6 Groundbreaking Innovations by Arab Americans, Heart surgeon, Dr. Michael DeBakey

New York: Views of the World Trade Center (both of its twin towers still under construction) and Manhattan skyline views taken from New Jersey shore.

The FAA Control tower and Concourse "C" at Denver International Airport.

Youths throw petrol bombs during the Battle of the Bogside in Derry, Northern Ireland, August 12, 1969.

Maze Prison Northern Ireland3RD OCTOBER: ON THIS DAY IN 1981 THE HUNGER STRIKES AT THE MAZE PRISON IN NORTHERN IRELAND, COME TO AN END Aerial view of the Maze Prison, where 38 IRA prisoners escaped. 14/3/95: Riot. 25/8/95. 24/3/97: Breakout Bid. 27/12/97: Man shot dead. 15/03/98: David Keys found hanged in cell. 11/11/98: Will shut at end of year 2000. 28/7/00: Prisoners released. * The London Docklands bomber and the border sniper who picked off police and troops on duty were among more than 80 terrorist prisoners set to stream out of the Maze prison. The final wave of early releases under the Good Friday Agreement was set to all but empty the infamous jail. (Photo by PA Images via Getty Images)

President Barack Obama, Vice President Joe Biden, Secretary of State Hillary Clinton and members of the national security team receive an update on the mission against Osama bin Laden in the Situation Room of the White House May 1, 2011, Washington, D.C.

The 21st century saw the dawn of the war on terrorism, as the 9/11 attacks and the Boston Marathon bombing dramatically changed society. Economic issues moved to the forefront during the Great Recession. The COVID-19 pandemic upended lives and economies around the world. Awareness of social inequality grew as the killings of Black Americans, including Trayvon Martin and George Floyd, spurred widespread protests.

21st Century

The 21st century has been a volatile period, beginning with the 9/11 attacks, the war on terrorism, the Great Recession and the COVID-19 pandemic.

21st Century: Terrorism, Recession & COVID-19 | HISTORY

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America’s Founding Fathers decided that one elected civilian—the U.S. president—would lead the executive branch of the federal government, a governmental structure that has remained in place for more than 200 years.

U.S. Presidents

<a href="http://www.christopherklein.com/">Christopher Klein</a> is the author of four books, including When the Irish Invaded Canada: The Incredible True Story of the Civil War Veterans Who Fought for Ireland’s Freedom and Strong Boy: The Life and Times of John L. Sullivan. His work has appeared in numerous publications, including The Boston Globe, The New York Times, and National Geographic Traveler. Follow Chris at <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.twitter.com_historyauthor&amp;d=DwMFaQ&amp;c=bHpC9irXhivtSwyVyKc43lLt4-cAwmmH7TeQLPqTb5E&amp;r=0ZpTu-He2V3GUI-VETMmkwm8-GyOWSyeMJXqt7G42KA&amp;m=K4QAG6bPcooItZtsSRYJId99sCdkkYnSQnbG55Y82ZU&amp;s=reHlmdZq8nMnpunXM6VDAaQCLeVwu9L3gbscryyWKD8&amp;e=">@historyauthor</a>.

Christopher Klein

Sarah Pruitt is a writer and editor based in seacoast New Hampshire. She has been a frequent contributor to History.com since 2005, and is the author of Breaking History: Vanished! (Lyons Press, 2017), which chronicles some of history's most famous disappearances.

Sarah Pruitt

Dave Roos is a journalist and podcaster based in the U.S. and Mexico. He's the co-host of <a title="https://urldefense.com/v3/__https://podcasts.apple.com/us/podcast/biblical-time-machine/id1648738323__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WOj0eb3mc$" href="https://urldefense.com/v3/__https://podcasts.apple.com/us/podcast/biblical-time-machine/id1648738323__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WOj0eb3mc$">Biblical Time Machine</a>, a history podcast, and a writer for the popular podcast <a title="https://urldefense.com/v3/__https://podcasts.apple.com/us/podcast/stuff-you-should-know/id278981407__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WORJo2DiQ$" href="https://urldefense.com/v3/__https://podcasts.apple.com/us/podcast/stuff-you-should-know/id278981407__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WORJo2DiQ$">Stuff You Should Know</a>. Learn more at <a title="https://urldefense.com/v3/__http://www.daveroos.com/__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WO_YrhCB4$" href="https://urldefense.com/v3/__http://www.daveroos.com/__;!!CyZMqN24eIU!HXBYfsRrBo7N5os-y_lSq05ShV3dCj9JEctYUd9Gok5iCyZHx7Gw2tqSCGiGSqkIqI2JpY9mKkYaNAhA-3WO_YrhCB4$">daveroos.com</a>.

Dave Roos

Iván Román is a freelance journalist, editor and communications consultant based in Washington, D.C. who has focused primarily on the country’s increasingly diverse racial and ethnic communities, its complex challenges regarding immigration, and Caribbean and Latin American affairs.

Iván Román

Patrick J. Kiger has written for GQ, the Los Angeles Times, National Geographic, PBS NewsHour and Military History Quarterly. He's the co-author (with Martin J. Smith) of Poplorica: A Popular History of the Fads, Mavericks, Inventions, and Lore that Shaped Modern America.

Patrick J. Kiger

Farrell Evans is an award-winning journalist who writes about sports and history.

Farrell Evans

Lakshmi Gandhi

Suzanne McGee

Elizabeth Yuko, Ph.D., is a bioethicist and journalist, as well as an adjunct professor of ethics at Fordham University. She has written for numerous publications, including Rolling Stone, The New York Times, The Washington Post and The Atlantic.

Elizabeth Yuko

The 1960s was one of the most tumultuous and divisive decades in world history. The era was marked by the civil rights movement, the Vietnam War and antiwar protests, countercultural movements, political assassinations and the emerging "generation gap."

1960s

Arab American

<a href="http://history.com/">HISTORY.com</a> works with a wide range of writers and editors to create accurate and informative content. All articles are regularly reviewed and updated by the HISTORY.com team. Articles with the “HISTORY.com Editors” byline have been written or edited by the HISTORY.com editors, including Amanda Onion, Missy Sullivan, Matt Mullen and Christian Zapata.

21st Century - Stories

On the Ground on 9/11: Video Footage

Timeline: What Happened at the Boston Marathon Bombing

6 Groundbreaking Innovations by Arab Americans

How 38 IRA Members Pulled Off the UK’s Biggest Prison Escape

How the Troubles Began in Northern Ireland

Deb Haaland, US Interior Secretary, on How She’s Influenced by History

9/11: How Air Traffic Controllers Managed the Crisis in the Skies

The World Trade Center, by the Numbers

After 9/11: 5 Cultural Moments That Helped Americans Move Forward

What Was Flight 93’s Target?

The World Trade Center’s Construction: 8 Surprising Facts

The Bin Laden Raid: Inside the Situation Room Photo