Since the introduction of the Monroe Doctrine in 1823, in which the United States vowed to prevent further European interference in the Western Hemisphere, the American military ever increasingly involved itself in the internal affairs of its Latin American neighbors. This book considers nearly 150 years of U.S. military intervention in Latin America, from naval patrols near turbulent Spanish colonies in the early 19th century, to the protection of U.S. interests during Caribbean rebellions at the turn of the 20th century, to later actions in Panama, Honduras, Cuba and Nicaragua.