Imperialism
-After the United States stopped gaining territory under an imperialist foreign policy, it still maintained an imperialist ideology under the Truman Doctrine, which led America to become:

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Under the Truman Doctrine, the United States effectively became the world's police and entered a new era of American imperialism. The first period of American imperialism was both ideological and territorial in nature, allowing the United States to acquire new territories, like the Philippines. The second half of the so-called American Century (the 20th) was no less grounded in an imperialist ideology, as the United States led the democratic world's fight against communism. After the fall of the Soviet Union near the end of the 20th century, America redirected its focus to thwarting terrorist cells.

Imperialism -After the United States Stopped Gaining Territory Under an Imperialist