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The first Atomic Bomb
The development of the first atomic bomb is signed into an agreement between the Prime Minister of Great Britain, Winston Churchill, and President Franklin D. Roosevelt -
Landing on Guadalcanal
The United States Marines landed on Guadalcanal in the Solomon Islands in the first American offensive of World War II. -
Jefferson memorial
The Jefferson Memorial in Washington, D.C. is dedicated on the 200th anniversary of Thomas Jefferson's birth. -
D-Day Invasion
Allied soldiers stormed the beaches of France to begin the World War II invasion of Europe that would lead to the liberation of Paris. -
Battle of Okinawa
American troops invade Okinawa, beginning the Battle of Okinawa, which would continue until June 21. -
death of President Roosevelt
President Roosevelt dies -
Germany Surrenders
The unconditional surrender of Germany at Reims, -
Hiroshima and Nagasaki
President Harry S. Truman gives the go-ahead for the use of the atomic bomb with the bombing of Hiroshima. Three days later, the second bomb is dropped on Nagasaki. -
Truman Doctrine
The Truman Doctrine is announced to the U.S. Congress. When passed it would grant $400 million in aid to Greece and Turkey to battle Communist terrorism -
The USSR Blockades
The Soviet Union begins its land blockade of the Allied sectors of Berlin, Germany. -
NATO
the North American Treaty Organization, is formed by the United States, Canada, and ten Western European nations. -
The Korean War
The Korean War begins its three-year conflict when troops of North Korea, backed with Soviet weaponry, invade South Korea. This act leads to U.S. involvement when two days later. -
Double Helix DNA
The description of a double helix DNA molecule is published by British physicist Francis Crick and American scientist James D. Watson.
