What is the invasion of proland what happened and what caused it

The Nazis invaded Poland on 1 September 1939. The Nazis justified the invasion by suggesting that Poland had been planning to invade Germany, and with false reports that Poles were persecuting ethnic Germans. On the 17 September, the Soviet Union joined forces with Germany and invaded Poland.

Explanation:

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explanation:

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to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.