Spain and the US.
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The US was attacked.
Japan, Germany, Italy.
The United States did nothing to end World War 1. In fact, the US opposed the end to the war.The war was ended by the signing of a treaty between all the European countries involved in the war, called the Treaty of Versailles. The signing of this treaty between the European countries ended the war. But the United States refused to sign it. However since all the other sides stopped fighting, the US had no choice but to stop fighting too. The US did not officially end their declaration until two years after the war actually ended.The US made no contribution towards the end of the first world war.
World War II got the U.S. out of the Great Depression and there was no fighting in the U.S. so the government didn't have to pay for the damage that other countries had to pay for.
Because everybody else had been fighting in the war for about 3 years, and they were all tire so when US came in we were fresh and new and all the other countries like the people we were fighting against were really tired and we were not tired.
The war in Vietnam, the Korean War, World War 1, World War 2...were fought against Nations (countries). The United States is NOT at war with Iraq nor Afghanistan. The US is at war with insurgents/terrorists (criminals that attacked New York City on 9/11); they just happen to be in the Iraq/Afghanistan regions.
They were still fighting the Germans
they were fighting against the germans, japanese, and italy
the US joined the fighting in 1941 after the bombing of pearl harbour by the Japanese
the US joined the fighting in 1941 after the bombing of pearl harbour by the Japanese