After world war 1 the United States wanted to isolate themselves from things like that because of how bad the war was. They went as far as to not join the league of nations that their President made himself with other presidents. After the Korean War, they decided to not isolate themselves and meddle as much as possible to prevent the spread of communism because it would strengthen the Soviet Union who was the main enemy.
They all help us in the United States to be what it is today
The Federalists wanted to ratify the Constitution, the Anti-Federalists did not. ... The Anti- Federalists claimed the Constitution gave the central government too much power, and without a Bill of Rights the people would be at risk of oppression