The attacks prompted a quick jump in American public support for war

Hitler declared war on the United States four days after Pearl Harbor

Despite having no treaty obligation to join Japan’s fight, Hitler declared war on the US on Dec. 11, 1941. The move pulled America into the European theater and is widely seen as one of Hitler’s most strategic blunders.

Japan's attack on Pearl Harbor caused heavy losses but failed to cripple the US navy

Japan’s air assault sank or damaged 18 warships (including eight battleships) and destroyed 188 aircraft, killing 2,403 Americans, yet all three Pacific Fleet aircraft carriers were absent and survived, and vital infrastructure like oil depots and repair yards remained intact—preserving core US naval power and enabling a rapid recovery. Watch original reporting here.

Roosevelt’s post-Pearl Harbor address became one of America’s most iconic speeches

Delivered to a joint session of Congress on Dec. 8, 1941, President Franklin D. Roosevelt declared Dec. 7 “a date which will live in infamy.” The speech, heard by tens of millions of Americans, helped consolidate national support for entering the war.

In the 1930s, Congress nearly passed a constitutional amendment requiring a national vote before declaring war

The Ludlow Amendment, proposed amid rising isolationism after World War I, would have required a national referendum before Congress could declare war, except in cases of direct attack. It was defeated 209 to 188 in 1938 after Roosevelt lobbied against it.

A list of reasons against dropping the bomb on Japan

One of the perennial moral debates, the dropping of nuclear bombs on Japanese cities prompted strong, polarizing reactions at the time. This article breaks down one side of the argument: that the bomb was designed for defense, using it was illegal and racist, and that there were alternatives.

Learn how Japan used the jet stream to launch attacks on US soil during World War II

In the final two years of the war, over 9,000 Fu-Go balloon bombs were launched from Japan, with about a thousand estimated to have reached North America. Six civilians killed by a Fu-Go bomb in Bly, Oregon, on May 5, 1945, became the only known deaths on American soil by enemy action during the war.

Rockwell's 'Four Freedoms' raised millions for the US war effort

Rockwell initially pitched the "Four Freedoms" project to the US Ordnance Department, but was rejected. Rockwell's editor at the Saturday Evening Post, however, loved the idea and published the images across four consecutive issues. After they became a sensation, the Saturday Evening Post partnered with the US Department of the Treasury to send the paintings on a 16-date national tour, which raised $133M in war bonds and stamps. Meanwhile, the Office of War Information printed four million sets of the posters with "Buy War Bonds" emblazoned on them.

How NATO responded to 9/11

The collective defense clause of the NATO constitution has only been invoked one time: after the 9/11 terrorist attacks against the United States. This video explores the immediate actions NATO took to respond to the attacks to support the United States. These firsthand clips from 2001 give a sense of the magnitude of the moment and the difficult decisions facing NATO leaders at the time.

The second attack used to justify full-scale US involvement in Vietnam never happened as reported

In August 1964, Washington claimed that North Vietnam launched two attacks on US destroyers in the Gulf of Tonkin. The second, used to justify escalating the US war effort, was later revealed to most likely have been a radar mistake.

The Chernobyl disaster prompted a sharp decline in public confidence in nuclear power

A Gallup poll from two months after the disaster showed 73% of respondents opposed building a nuclear plant near their homes—up from 45% in 1976. Chernobyl and other nuclear accidents remain in the public consciousness today in debates about nuclear power.

The US sent an iconic photographer to document the Japanese-American internment

After the attack on Pearl Harbor, 120,000 Japanese-Americans were removed from their homes and businesses and sent to internment camps across the American West and Arkansas. This nearly 15-minute video explores how the US government sent famed photographer Dorothea Lange to document the transfer and internment, only to restrict or impound many of her photos when they seemed less than positive.

Views on the Nixon pardon softened over time

Americans initially rejected Ford's September 1974 pardon of Nixon—38% approved it versus 53% disapproved—but by 1986, a slim majority (54%) believed it was the right call, showing that public sentiment softened over more than a decade after the controversy.

Key was initially opposed to the War of 1812

Like the majority of Americans, Francis Scott Key was opposed to the US declaring war on Great Britain, calling the move “abominable.” His feelings began to change after the British raided Washington, D.C. He joined the Georgetown Artillery shortly after.

Teenager Guy Gabaldon captured the most prisoners in US military history

After the vicious battle of Saipan outside Japan in World War II, the Japanese were opting for suicide rather than surrender. Gabaldon, a Marine with a track record for skillfully convincing the enemy to surrender, managed to capture 800 Japanese single-handedly.

Japan committed mass war crimes during its invasion of China

During the 1937 invasion, Japanese forces carried out systematic atrocities—including mass executions, rape, torture, forced labor, and chemical warfare. The Nanjing Massacre alone killed tens of thousands over a span of six weeks, with some estimates claiming 300,000.

World War I brought attention to US reliance on mineral imports

Domestic stockpiles were inadequate for the extended trade disruptions caused by the four-year war. In response, the US Geological Survey increased its geological mapping to help search for important metals alongside new oil fields for fuel.

Jazz's popularity inspired a moral panic

When jazz exploded in the 1920s, some believed the music's sudden popularity was the sign of a rotten nation, with one 1920 address at the University of Wisconsin proclaiming, "We are in deadly fear of the Jazz Devil, the demon which is consuming the country." Often, the connections were racialized, with columnists and preachers suggesting that jazz's Black artists were attempting to degrade white America.

The president has the sole authority to call for a nuclear strike

Under current US policy, the president alone can order the use of atomic weapons at any time without requiring prior approval from Congress—a power rooted in the president's role as commander in chief.

Americans are historically more supportive of free speech than people in most other countries

A 2016 survey of 38 countries found that the US scored highest in support for free expression, with 71% of Americans saying people should be able to say what they want without government censorship, more than in any other nation surveyed.

Penicillin production was just behind the atom bomb in wartime priorities

By 1943, the US War Department made penicillin its second-highest priority—just after the Manhattan Project. Producing enough of the antibiotic for the D-Day invasion became a central mission of Allied science and industry.

Women's role in society expanded during the war

With millions of men at war, women managed farms and businesses, served as nurses, and organized aid efforts—broadening women's participation in public life and laying the groundwork for future suffrage movements.

Picasso's 'Guernica' protested the bombing of a Basque village

By 1937, Picasso's fame and influence had already made him a legend. Yet an unprovoked war crime in Guernica, Spain that same year—where 25 bombers dropped 100,000 pounds of bombs and explosives on civilians—inspired one of his most moving works.

Travel in time to how people felt about major US events

Pollsters track more than just politics: From civil rights to war declarations, go back and see how people felt about major events in the US with this timeline.

Coverage of the 9/11 terrorist attacks helped shape Wikipedia's editorial policies

Launched nine months earlier, the site was featured on Yahoo's news page, attracting traffic from information seekers as dozens of new editors created hundreds of articles, including memorials, conspiracy theories, and donation and volunteer pages. Discussions between editors would begin establishing rules for handling breaking news events.

The US unemployment rate soared to over 24% during the Great Depression

The Great Depression was a devastating and prolonged economic recession that followed the crash of the US stock market in 1929.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

The US dollar is the most widely circulated currency in the world, and is involved in nearly 90% of global transactions

Fireworks-related ER visits are on the rise—in 2024, they increased by 52% as compared to the prior year.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Despite being favored by 87% of Americans, Congress does not have term limits.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

See the most iconic photos from four decades of LIFE magazine

In 1915, workers recovered a submarine-like vessel from the Chicago River, prompting fears of German espionage

View the ten deadliest tornadoes in US history.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

Sunflowers have long been a symbol of nuclear disarmament because they can extract large amounts of radioactive cesium from soil.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

In 1939, baseball star Lou Gehrig delivered his inspirational 'Luckiest Man' speech after retiring due to the health condition that now bears his name.

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Brandi Chastain, the star of the 1999 US victory over China in the 1999 Women's World Cup, was a last-second choice to take the penalty kick that sealed the victory.

The Beatles' US label rejected the band's first two singles, 'Please Please Me' and 'From Me to You,' with one executive calling the band 'dead in the water.'

Experimental hantavirus vaccines and therapies, still under development, have long been funded by the US military.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Fish populations in the Great Barrier Reef have increased after installing waterproof speakers on the ocean floor that played recordings of sounds from healthy coral reefs.

Poison ivy's characteristic rash is caused by an allergic response to an oily compound in the plant called urushiol.