The Republican Presidents of the 1920's generally followed a foreign policy based on what principle in the document?

Isolationism, if thats not an answer choice then its noninvolvement

Explanation: im taking a similar test right now lol

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )

during the early years of world war i, the germans used "the submarine" to a great advantage