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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
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Allied soldiers stormed the beaches of France to begin the World War II invasion of Europe that would lead to the liberation of Paris. Operation Overlord gained footing quickly, pushing through the Atlantic Wall in the largest amphibious military operation in history.
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President Roosevelt dies suddenly; Vice President Harry S. Truman assumes the presidency and role as commander in chief of World War II.
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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, Japan. On August 15, Emperor Hirohito of Japan surrenders.
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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
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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, the United States Air Force and Navy are ordered by President Truman to the peninsula.