During World War I, the Germans destroyed much American commerce on the Atlantic Ocean. While the pleas from Europe were part of the equation, the destruction of American shipping was the main factor in the United States entering the war.
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World War II. We realized that if we left the rest of the world alone, the Soviets would take over, and the U.S. did not want that, so we started becoming more involved in the world. The fact that we were the leading superpower post-WWII didn't hurt either.
Primarily President Franklin D. Roosevelt. But President Harry Truman finished World War 2. But Franklin really got America through the war.
Five things that occurred that led America out of isolationism were the Boxer Rebellion, the Open Door Policy, the Spanish-American War, Japanese-Russian settlement, and the Algecircas Conference.
Fear
Though I do not specifically know the president that suggested it, or if it ever has been, I believe that I saw on Merriam Webster that the first implementation of isolationism was in 1922, therefore Washington wouldn't have suggested it. Anyways, Washington didn't suggest it.
In the era preceding World War II, the isolationism of various Western nations contributed to the "march of aggression" by nations such as Italy and Germany, among others. The isolationism of the United States, in particular, was an important element in the confident moves of the Axis powers, as they reasoned (for the most part, correctly) that unless they directly threatened America it would not choose to become involved in any overseas war.
Isolationism is an ideology that claims itâ??s best to stick to the affairs of ones own country and leave the affairs of other countries to them. Principle beliefs under Isolationism include protectionism and non-interventionism. Two prominent American isolationists were Thomas Paine and George Washington.