During the first half of the 20th century the United States became engaged in a series of local conflicts in Latin America, which went into history as banana wars. The main purpose of these wars were to defend American commercial interests in the region. Later, U.S. Marine Corps Major General Smedley Butler famously wrote, "I spent 33 years and four months in active military service and during that period I spent most of my time as a high class muscle man for Big Business, for Wall Street and the bankers.