Question

in 1914, most of europe was entering world war i. why didnt the united states join the war?
the united states had an isolationist policy. in other words, it did not want to join the wars of other countries.
the united states joined the war secretly. it was arming, or sending weapons, to germany.
the united states was an impoverished, or poor, country at the time. it did not have the money to fight in a war.

Explanation:

The key reason the U.S. didn't join WWI in 1914 is its isolationist policy, which avoided involvement in foreign wars. The other options are incorrect: the U.S. didn't join secretly (it armed Allied powers later, not Germany), and it was not impoverished at the time.

Answer:

The United States had an isolationist policy. In other words, it did not want to join the wars of other countries.