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Nuclear Fission
Discovered by German scientists, this makes an atomic bomb a theoretical possibility. -
Letter to President Roosevelt
Einstein assisted other scientists who wrote a letter to President Roosevelt which urged him to take steps to be on the forefront of nuclear weapons research so that other nations ,such as Nazi Germany, don't get there first. -
Manhattan project
Funded by President Roosevelt, -
Manhattan project relocated to New Mexico
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America drop bombs on Nagasaki and Hiroshima
Since Japan attacked Pearl Harbor, the Americans responded with these bombings. -
Marshall Aid to the West of Europe
Stalin, who was the leader of the USSR, refused this offer for Eastern Europe -
Start of the Berlin Blockade
Started in 1948 and ended in 1949 -
NATO established
USSR exploded their first atomic bomb. China also became a communist country -
US explodes first hydrogen bomb
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USSR explodes the first Hydrogen bomb