why did the united states switch from a policy of isolation to a policy of imperialism in the late 1800???

One reason was that they had already expanded to the Pacific Ocean, and there were people in our country that believed it was our duty to spread our way of life to other countries.

Explanation:

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions