The united states pursued an isolationist foreign policy for its first 150 years as a nation. for what reasons was this approach a reasonable one at the time ?

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

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