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Nazis invade Poland
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Winston Churchill becomes the new prime minister of Britain.
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Belgium surrenders to Germany
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Australian troops capture Bardia, Libya.
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The U.S. Congress passes the Lend-Lease Act giving Roosevelt the authority to sell, transfer, or lease war goods to the government of any Allied country, thereby effectively ending American neutrality.
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The Declaration of the United Nations is signed by the leaders of 26 nations.
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The first U.S. troops arrive in Britain.
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Australian and U.S. Army forces under MacArthur fight back the Japanese at Buna in New Guinea.
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The Allies begin massive bombing campaign of Germany
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The first atomic bomb dropped on Japan.