How is the United States an imperialist nation?

In the late nineteenth century, the United States abandoned its century-long commitment to isolationism and became an imperial power. After the Spanish-American War, the United States exercised significant control over Cuba, annexed Hawaii, and claimed Guam, Puerto Rico, and the Philippines as territories.

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Imperialism is the belief that one country has the capacity to conquer another and subjugate its territory. Imperialism can be seen in the United States' spread of influence into the Philippines, Puerto Rico, and Guam.

Explanation:

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protected civil liberties and outlawed slavery in the new territories.