Why did the U.S. during the 19th century, generally speaking, have a history of a policy of isolation and noninvolvement in foreign affairs?

Why did the U.S. during the 19th century, generally speaking, have a history of a policy of isolation and noninvolvement in foreign affairs? What factors sparked the imperialist fervor during the 1890s? What were the various intellectual, socioeconomic, and political justifications for expansionism? How did these factors, along with public opinion, lead the U.S. to declare war on Spain? What new territories did the U.S. gain as a result of the war, and why was American presence often not welcomed in these areas? Please discuss and explain your answer to each portion of the question.

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