Witch statement about the organs of the american population is true

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

What pact signed on 1949 reinforce that the united states would not return to an isolationist policy

How are isolationism and nativism related ? in the 1920s what actions did americans take that reveal their distrust of others