Signed on June 28, 1919, exactly five years after the assassination of Archduke Franz Ferdinand, the Treaty of Versailles followed the Versailles Peace Conference and officially ended World War I.

William Lyon Mackenzie King was Canada's longest serving prime minister at 21 years, 154 days, non-consecutively. He is best known for his leadership of Canada throughout the Second World War (1939-1945).

Leonid Brezhnev presided over the country from 1964 until his death in 1982. His eighteen-year term as General Secretary was second only to that of Joseph Stalin in duration.

The Battle of Britain, in which the Royal Air Force defended the United Kingdom against attacks from the German Air Force (Luftwaffe), was the first entirely aerial military campaign, as well as the first significant defeat for the Axis powers during World War II.

At the Battle of Monmouth in June 1778, Mary Ludwig Hays attended to the Revolutionary soldiers by bringing them water, often under heavy fire from British troops.

Pericles promoted the arts and literature, and it is principally through his efforts that Athens holds the reputation of being the educational and cultural center of the ancient Greek world.

The Intolerable Acts were the American Patriots' term for a series of punitive laws passed by the British Parliament in 1774 after the Boston Tea Party and meant to punish the Massachusetts colonists for their defiance. The British hoped these punitive measures would reverse the trend of colonial resistance to parliamentary authority, but tensions soon escalated, and the American Revolution broke out in April 1775.

Alexander the Great spent most of his ruling years on an unprecedented military campaign through Asia and northeast Africa, and by the age of thirty he had created one of the largest empires of the ancient world, stretching from Greece to northwestern India. He was undefeated in battle and is widely considered one of history's most successful military commanders.

Crispus Attucks was the first person killed in the Boston massacre and is widely considered to be the first American casualty in the American Revolutionary War. Of Wampanoag and African descent, he became an icon of the anti-slavery movement in the 18th century and was held up as a Native American who played a heroic role in the history of the United States.

On April 24, 1778, Captain John Paul Jones emerged as the first American naval hero, capturing the HMS Drake, the first victory for any American military vessel in British waters.