I assume you mean either of the world wars? The main reason was that the USA had no interest in getting dragged into European wars, which looked to be costly and destructive. Esp. during the First World War, the USA actively traded with members on both sides, and during the first half of the war they were more symathetic with Germany.
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George Washington wanted to stay in the war because the military was very weak and the country was in debt.
that roosevelt was trying to lead them into a war they didnt want or need-apex
The American people did not want to go through another war. the U.S. also didn't have the finances to pay for another war, considering we were in the great depression at this time.
It wanted to stay isolated. It did not want to get involved into a 'European' affair. The German sinking of the Lusitania was a reason the U.S. entered Worl War I and the Japanese bombing of Pearl Harbor, Hawaii was the reason the U.S. entered World War II.
because thay didn't want to die
Russia was not involved in the US Civil War. A civil war is defined as a war fought between groups which are all from one country.