“American imperialism” is a term that refers to the economic, military, and cultural influence of the United States internationally.
Let me explain.
The late nineteenth century was known as the “Age of Imperialism,” a time when the United States and other major world powers rapidly expanded their territorial possessions.American imperialism is partly based on American exceptionalism, the idea that the United States is different from other countries because of its specific world mission to spread liberty and democracy.One of the most notable instances of American imperialism was the annexation of Hawaii in 1898, which allowed the United States to gain possession and control of all ports, buildings, harbors, military equipment, and public property that had belonged to the Government of the Hawaiian Islands.Some groups, such as the American Anti-Imperialist League, opposed imperialism on the grounds that it conflicted with the American ideal of Republicans and the “consent of the governed.”
And this is the longest explanation i have ever given... i think.