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It started in the Victorian era and, believe it or not, the pictures were initially meant to be happy reminders for the families of the deceased.

But the plan was never really about defeating the undead.

"Some of us were luckier than most: to capture the moment and then come home. Therefore, we honor those… who didn't come home."

According to NYU professor Elizabeth Phelps, "everyone needs to be a little aroused."

America's early puritan inhabits wanted nothing to do with the heathen holiday. Then the Irish arrived.

They fed it with an eye dropper straight into its esophagus.

Everyone knows how the Trojan War ended — with a bunch of guys piling out of a giant horse — but how did the whole mess kick off?

There were many catalysts that led to the Revolutionary War, but a certain act in 1773 concerning taxation on tea was definitely the last straw for American colonists.

Sometimes the answer lies not in seeking out fantastical monsters, but in understanding human perception.

Two-thirds of the people interned in the camps were native-born American citizens. Many would later volunteer in the war, despite the general atmosphere of hostility surrounding them.

In 1964, Lyndon B. Johnson needed an excuse to start a war. Two alleged engagements on August 2 and 4 finally gave him the chance.

"Knightfall" premieres December 6th.

Before the US joined World War II, the Lend-Lease Act was the main means to support the US's military allies. Perhaps unsurprisingly, not everyone approved of it.

It's thanks to the labor movement that we have the marvelous "work-free weekend."

Emperor Hirohito saw it all, as Japan hit its lowest lows, only to go on to hit incredible highs.

The United States military sprayed over twenty million gallons of Agent Orange across the nation of Vietnam, a decision that would affect those exposed for decades to come.

"Tensions between the United States and the Soviet Union resulted in the formation of key alliances that would endure throughout the Cold War."

Saddam Hussein's invasion of Kuwait in 1990 ultimately set off chain reactions that led to his capture and execution in the 2000s.

The eight-year war between the two nations all began with a waterway.

A decree enacted to quell tension between Native Americans and colonists became a wedge between the British monarchy and Americans.