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In 1989, Chinese protesters demonstrated in Tiananmen Square. On June 4 of that year, Chinese troops entered the square and shot at civilians. The number of deaths is estimated to be in the hundreds to thousands.

On June 28, 1914, Archduke Franz Ferdinand and his wife were assassinated by Serbian nationalist Gavrilo Princip. A month later, Austria-Hungary declared war on Serbia with Germany's support.

Ernesto "Che" Guevara was born June 15, 1928. Prior to becoming a revolutionary, he studied medicine at the University of Buenos Aires.

On January 10, 1920, the League of Nations was created. After World War II, the League of Nations was dissolved and replaced with the United Nations. In total, the League of Nations lasted 26 years.

Over the course of 80 years, England sent over 160,000 convicts to Australia. The major colonies were New South Wales, Tasmania and Western Australia.

The Berlin Wall was constructed in 1961. While more than 5,000 East Germans were able to escape over the wall, 171 people were killed trying to get to West Germany.

From 1929 to 1953, Joseph Stalin was dictator of the USSR, which stands for the Union of Soviet Socialist Republics. He was born on December 18, 1878 as Josef Vissarionovich Djugashvili and took the name Stalin in his 30s, which means "man of steel."

Christopher Columbus crossed the Atlantic Ocean four times for Spain. His trips took place in 1492, 1493, 1498 and 1502.

Winston Churchill was born on November 30, 1874 to an American mother and a British father. He would serve as Prime Minister of the United Kingdom twice: once from 1940 to 1945 and again from 1951 to 1955.

The Reign of Terror lasted from September 5, 1793 to July 1794. On September 5, 1793, Maximilian Robespierre declared terror to be "the order of the day." The Reign of Terror ended on on July 28, 1794 with the execution of Robespierre.

Grace Kelly married Prince Rainier. They remained married until her death in 1982.

Cleopatra VII became pharaoh after the death of her father, Ptolemy XII. She was a member of the Ptolemaic dynasty and came from Macedonian Greek ancestry.

In 1990, Mikhail Gorbachev received The Nobel Peace Prize for his role in bringing the Cold War to a peaceful end. The collapse of the Soviet Union would officially end the Cold War in 1991.

The European Union was founded on November 1, 1993 in Maastricht, Netherlands. However, the concept of a united Europe started in 1950 with the European Coal and Steel Community, which had six member nations.

The Troubles lasted approximately 40 years. The Irish Republican Army and other Catholic paramilitary groups staged bombings, kidnappings and murders with the goal of a United Ireland.

The RMS Lusitania was traveling from Liverpool to New York City. It sank off the southern coast of Ireland, killing approximately 1,200 people.

Gaius Cassius Longinus, Decimus Junius Albinus and Marcus Junius Brutus led the conspiracy to assassinate Julius Caesar. Caesar was killed on March 15 of the year 44 BC.

Erik the Red was born Erik Thorvaldsson in Norway. His son, Lief Erikson, would visit North America before Christopher Columbus.

Charlemagne was crowned emperor in 800. The empire lasted for over 1,000 years until Napoleon and the French destroyed it in 1806.

In 1814, Napoleon was forced to abdicate to Elba. However, he escaped in February 1815 and regained control of France. Eventually, the British exiled him to Saint Helena, where he would die six years later.

In 1206, Genghis Khan founded the Mongol empire. At it's peak, it covered 9 million square miles. The empire collapsed in 1368.

Mumbai is India's most populous city. As of 2011, over 18 million people live in the city.

The Cold War began in 1945. It lasted for 45 years and ended with the dissolution of the Soviet Union.

The "Entente" comes from the French word for "understanding." In World War I, the Triple Entente fought against the Triple Alliance, which consisted of Germany, Austria-Hungary and Italy.

The United States purchased Alaska in 1867. Those against the purchase nicknamed it "Seward's Folly" because William H. Seward was the Secretary of State at the time.

Military activity is forbidden in the Korean Demilitarized Zone. However, the border after the strip is heavily guarded. The Korean Demilitarized Zone is 160 miles long and approximately 2.5 miles wide.

The Soviet invasion of Afghanistan lasted approximately 9 years. The Soviet Union joined the Afghan Civil War to support the Democratic Party of Afghanistan's control of the government because mujahideen insurgents were fighting to overthrow it.

Golda Meir served as Prime Minister of Israel from March 17, 1969 to June 3, 1974. She was born in Kiev and immigrated to the United States in 1906.

The Geneva Accords were a result of the Geneva Conference, which took place from April 26 to July 21, 1954. They consist of 10 documents.

The Iran Hostage Crisis started on November 4, 1979 when a group of Iranian students stormed the U.S. Embassy. It would end 444 days later on January 21, 1981. The crisis ended hours after Ronald Reagan's inauguration.

The Ottoman Empire lasted 600 years. It ended in 1922. The empire was succeeded by the Turkish Republic.

As Saigon, the city was the capital of Cochinchina, a French colony. It was renamed on July 2, 1976.

The Falklands War is also known as the Malvinas War. The war lasted 10 weeks. It began on April 2, 1982 and ended with Argentina's surrender on June 14, 1982.

Edmund Hillary reached the summit of Mount Everest with Tenzing Norgay. The two men spent about 15 minutes at the summit.

The United Nations was formed on October 24, 1945. To form the UN, 50 countries met in San Francisco to draft the UN Charter.