July Fourth wasn't always a holiday, and its meaning has changed over time

Independence was approved on July 2, not July 4

This video highlights lesser-known facts about the Declaration of Independence, including that Congress approved independence on July 2—leading many Founders to believe that would be the day Americans would celebrate their independence.

Hear about the Enlightenment origins of the Declaration's ideas

This podcast examines the Enlightenment thinkers and earlier political texts that influenced the Declaration, demonstrating how Jefferson built upon existing ideas rather than inventing them wholesale.

Learn about the long and contested history of free speech in America

This podcast examines how American free speech protections evolved—from the Founders' debates to landmark Supreme Court rulings—and why the country arrived at one of the most expansive speech regimes in the world.

Martin Luther King Jr. invoked the Declaration to demand equality

This article examines how Martin Luther King Jr. drew on the language and ideals of the Declaration of Independence to frame the Civil Rights Movement as a continuation of the nation’s founding promises.

The origins and growth of the Juneteenth holiday

The American holiday of Juneteenth celebrates the emancipation of African American slaves, a process which unfolded over the four years of the Civil War and several months afterward. June 19 took on special significance as the day Union officials proclaimed slaves free in Texas in 1865, the last holdout after the Civil War ended. Roughly 4 million people were freed from slavery as a result of emancipation. Read this brief article summarizing the holiday's development.

Americans' love of combining freedom and charred meat began in the 1800s

In the 19th century, politicians (particularly in Virginia) hosted large public barbecues to celebrate Independence Day and, of course, boost their own campaigns. When personal grills became common in the 20th century, the tradition moved into backyards and block parties, where it's still going strong today.

Hear the story of Dr. Martin Luther King Jr.'s 'I Have a Dream' speech

This podcast traces Dr. King’s path into the Civil Rights movement and the buildup to the 1963 March on Washington, unpacking how his speech became a defining moment in US history.

Hear how the Super Bowl went from a risky experiment to America's unofficial holiday

In this podcast episode, former Emmy award-winning ESPN producer Dennis Deninger traces the Super Bowl's unlikely rise from the AFL-NFL merger era to a national spectacle, explaining how it reshaped advertising, gambling, television, and American culture.

The holiday has evolved alongside its participants' cultural identities

The Day of the Dead blends various traditions, including Aztec myth, Mexican heritage and Chicano identity. That makes for a complex and evolving holiday. This conversation between Cynthia Vidaurri, a Smithsonian folklorist, and Lalo Alcaraz, a cultural consultant for “Coco,” analyzes how the varied influences have created the modern holiday.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

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.

The origins of Father's Day

Father's Day occurs on the third Sunday in June in the US. It was inspired by the same movement that advocated for Mother's Day, and was first celebrated in 1910. However, the day wasn't official until 1972, many decades after its counterpart, Mother's Day, was formally adopted as a holiday.

For many Jewish people, Hanukkah represents the resilience of their community

Today, many Jews interpret Hanukkah in the context of several centuries of history, including the Holocaust. Alan Avery-Peck’s essay explores how the holiday's meaning has evolved according to each generation's struggles.

Many myths continue to circulate about the first Thanksgiving

The Thanksgiving myth didn’t really start in 1621, argues historian David Silverman in this interview with Smithsonian. Rather, it took hold over 200 years later. During the Civil War, Thanksgiving was declared a national holiday by Abraham Lincoln as a way to promote national unity. The tidy story of friendship between Native Americans and colonists was used to quell racial tensions of the late 19th century.

BBC Radio 4 tackles the history of Stonehenge

On this podcast, host Greg Jenner humorously unpacks Stonehenge’s biggest myths and mysteries—from what a “henge” actually is, to how alien theories emerged, and why the monument was once sold for just £6,000.

The dark origins of Valentine's Day.

The holiday began as a feast to celebrate the decapitation of a third-century Christian martyr, or perhaps two. So how did it become all about love?

'Vacation' wasn't common for Americans until the mid-1800s

Although we now consider vacation to be an integral part of the summer season, the concept didn't exist in the US until the middle of the 19th century. Even then, it was still a luxury and didn't become a middle-class norm until the early 20th century.

Daylight saving time, explained

Daylight saving time is supposed to help—but does it? Dive into the history, science, and consequences of this biannual aspect of American life (unless you're from Arizona or Hawaii).

One pop-culture historian fooled the nation with a fake origin story of April Fools' Day

In 1983, Joseph Boskin, a professor at Boston University, was interviewed by the Associated Press to discuss the history of April Fools'. Boskin shared a made-up story about a jester who took over Rome for a day and proclaimed that April 1 would henceforth serve as 24 hours of silliness. AP published the fib about "King Kugel," creating buzz and confusion for news outlets around the country.

The evolution of the Olympics from ancient Greece to the modern world

The Olympic Games have evolved from a sacred footrace in 776 BCE honoring Zeus to a global celebration of athletic excellence and unity. Ancient Greek city-states set aside their conflicts under a sacred truce for events like wrestling and chariot racing. Though the Games ended in 393 CE, Pierre de Coubertin revived them in 1896, adding modern elements like the torch relay and the inclusion of women. Watch 1440's breakdown of the historic event here.

The real stories behind America's national parks

The history and impact of national parks is complex. The authors of "Olmsted and Yosemite: Civil War, Abolition, and The National Park Idea" curated this list of nonfiction books examining American national parks from a variety of perspectives.

How income taxes evolved from a funding tool for war into a crucial revenue source for the federal government

Americans have long resisted income taxes. So, how did they become permanent? This overview explains how wartime funding needs, constitutional changes, and economic shifts gave rise to the modern tax system, from the Civil War to the payroll withholding rules we follow today.

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

What the stars once meant to ordinary people

The stars were a crucial aid for ordinary human beings in premodern societies, acting as regular timekeeping phenomena and celestial navigators. Today, light pollution and modern technology have rendered the stars a mere aesthetic delight for most of us, but their significance in history remains. Watch this brief video to learn how premodern humans used the stars for navigation, mathematics, and more.

'Under God' was added to the pledge in 1954 as an anti-communist statement

When President Eisenhower signed the phrase into law on Flag Day 1954, the intent was ideological: to distinguish American democracy from "godless" Soviet communism. The author of the original 1892 pledge, Francis Bellamy, was himself a Baptist minister who believed in the separation of church and state, making the addition an inversion of his intent.

Labor unions, explained

The weekend is one of many benefits shaped by labor unions. These organizations, representing millions of workers, have influenced much of modern work life, from wages to safety standards. With roots stretching back to the 18th century, unions have long been at the center of change in labor rights.

The US national anthem borrowed its melody from a British tavern song

Key’s original poem, “The Defence of Fort M’Henry,” was written to the meter of a well-known drinking song: “The Anacreon Song,” also known as “To Anacreon in Heaven.” The original song has more than a few sexual innuendos and was written by a Brit, two details that seem at odds with the serious and patriotic lyrics of Key’s poem.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

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

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

The rivalry between Alexander Hamilton and Thomas Jefferson centered on federalism—the question of how much power the federal government should hold relative to the states.

Before writing 'Walden,' transcendentalist Henry David Thoreau nearly burned down his hometown with a campfire that grew out of control.

A researcher recently discovered an interview from 1967 between groundbreaking journalist Joan Didion and the Grateful Dead, years before the band became an institution.

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.

Listen to an in-depth conversation on the links between Parkinson's disease and herbicide exposure and the challenging pace of scientific investigation.

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks

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

After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

SpongeBob exemplifies Aristotle's philosophy for living well because he understands that happiness doesn't come from external factors like money, recognition, or power.

Poison ivy was sent to Europe in the 1600s as an exotic, ornamental oddity, where it was purposefully grown in the English royal gardens at Kew, the Faculty of Medicine in Paris, and a few other locations.

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

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.

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.