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The development of the first atomic bomb started in an agreement between the Great Britain and the United States -
Great Britain, the United States, and the Soviet Union meet to discuss an agreement to invade Europe in June of 1944. -
Allied forces stormed the beaches of Normandy and began the invasion that would eventually liberate Paris -
American troops invade Okinawa, which starts one of the determining battles of the war that lasted until June. -
President Roosevelt dies, assuming Harry Truman as the next president. -
Germany surrenders in France, concluding the war in Europe. -
President Harry Truman gives a green light to drop the atomic bomb on Hiroshima, Japan. Three days later, when Japan still didn't surrender, another bomb was dropped on Nagasaki. -
Emperor Hirohito of Japan surrenders, and World War II ends. -
Truman Doctrine is passed, granting $400 million dollars to Greece and Turkey in order to help fight communism. -
The North American Treaty Organization is established between the United States, Canada, and ten other European nations. Treaty stated that any attack against any nation is an act of war against them all. -
The Korean War begins when North Korea invades South Korea with soviet weaponry.