isolationists
They were known as isolationists, and they believed that the United States should stay out of other countries' politics and conflicts. They argued that the country should focus on domestic issues rather than forming alliances with other countries.
Their objection stemmed from the notion that America's global engagement may expose the country to hazards and that the nation's neutrality and security might be jeopardized if it became involved in foreign alliances.
They thought that American international interventionism would result in increased economic exploitation and a loss of other nations' sovereignty.