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Roosevelt suffered many things from WWI, he had arthritis and had to walk with a cane. He also suffered from heart issues, which he had kept a secret. The ultimate cause of his death was a heart attack.
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The first bomb was dropped in a Japanese city called, Hiroshima. An estimated 80,000 people died from the bomb, then later tens of thousands would die from the radiation that they were exposed to.
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America joined the United Nations so that the organization would succeed at keeping the peace. However, joining the organization took longer than expected because of isolationists within congress.
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This act established the CIA as an independent agency within the executive branch. The Act gave the CIA more responsibilities and gave them the duties of national security.
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President Harry Truman signed the Marshall plan. The plan was designed to rehabilitate the economies of 17 western and southern European countries to create stable conditions that people could survive in after WWII.
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President Harry Truman ordered the development of the hydrogen bomb. He ordered the development because of the soviet's first atomic bomb in 1949.
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The Nautilus was the very first nuclear-powered submarine. The keel was laid on the 14 then 18 months later the sub was launched.
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Eisenhower became the 34th president in 1953.