When washington said that the united states would be "friendly and impartial" in regard to foreign conflicts what was his reason behind this statement

Washington said that the United States would be "friendly and impartial" in regard to foreign conflict. What was his reason behind this statement?

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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.