U.S. imperialism consists of policies aimed at extending the economic, political, cultural and military influence of the United States over areas beyond its boundaries, especially considering the Marxist definition of imperialism as originally defined by Lenin, but other aspects of imperialism as well, such as military operations and economic terrorism.
Doctrines followed (and sometimes proposed by the U.S. government itself since its inception) such as Manifest Destiny, Monroe and his Roosevelt Chorolary, the Big Stick, the National Security Doctrine, etc. and events such as the conquest of the West, the Mexican war, the banana wars, the Spanish-Cuban-American war and, more recently, the Vietnam War, the U.S. blockade against Cuba, the war in Afghanistan, etc. have made "American imperialism" a term accepted by the greater part of the international community.
The United States has interfered in the elections of 45 foreign countries[1] and done numerous CIA and military interventions around the world.[2]