How did isolationism in the united states start?

Answer:

When George Washington stepped down from the office of American President in 1799, he warned America to stay away from foreign alliances, especially those in Europe, because at the time, the infant American nation was not strong enough to frequently get involved in military campaigns abroad. So, George Washington's warning to America caused America to stay nestled in isolationism for about one hundred and fifty years until the Japanese attack on Pearl Harbor in 1941 caused the Americans to declare war on the Axis Powers.

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