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The Nationalists outnumbered the Communists and drove them out of South China. The Communists then had to march 6,000 miles to the caves of Shaanzi in the north in order to reach safety.
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After the invasion of Poland by Germany and Russia, France and Great Britain finally declared war on them. This was a major change because up until then, the other European countries had allowed Germany to do whatever they wanted in hopes of avoiding another huge war.
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The attack on Pearl Harbor drew the US into WWII and caused them to declare war on Japan, which soonafter led to war with the other axis powers.
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The war in Europe ended on May 9, the day that Germany surrendered.
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The atomic bombs that were dropped on Hiroshima and Nagasaki forced Japan to surrender and finally end WWII.
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The United Nation was formed in order to help prevent another world war like this from ever happening again.