American imperialism or US imperialism is the exercise of power or control by the US outside its borders. It operates through military conquest; military protection; gunboat diplomacy; unequal treaties; support for preferred factions; regime change; economic or diplomatic support; economic interference via private companies, or influence on local culture and media, potentially followed by intervention when American interests are threatened.
American imperialism and expansionism took the form of "New Imperialism" beginning in the late 19th century, although authors such as Daniel Immerwahr consider earlier American territorial expansion across North America at the expense of Native Americans to fit the definition. While the US has never officially identified itself and its territorial possessions as an empire, some commentators have done so, including Max Boot, Arthur M. Schlesinger Jr., and Niall Ferguson. Other commentators have accused the US of practicing neocolonialism—dominating territory via indirect means—which leverages economic power rather than military force.
