Which of the following was a reason some americans were in support of american imperialism? question 1 options: immigration needed to be restricted the us needed to maintain their isolation from other countries the need for natural resources and new markets the us should not expand beyond its current borders

The answer is the third one down. <<<< short answer.
That is always the reason for imperialism. I know of no other to tell you the truth with the possible except of Rome. Rome became very good at fighting defensive wars. She was attacked and she played brilliant defense, to put it in sports terms.

In modern times, I can't think of a major war that was not fought on imperialistic terms. India Bismark's Germany Kaiser all fought because they did not have natural resources from colonization. Even Hitler ran into that problem.