From 1800 to the present, US troops have intervened thousands of times in Latin America and have occupied its countries on dozens of occasions. Interventions were short-term and superficial, while occupations lasted longer and controlled local governments. The causes of these troop landings reflected the United States’ motivations as it expanded from a strong, large republic into first a continental and then an overseas empire at the expense of its smaller, weaker neighbors. Those motivations included colonial land hunger, cultural chauvinism, the exploitation of resources, the search for markets abroad, competition against other great powers, political reformism, global ideological struggle, and the perception that US domestic problems originated in Latin America. US troops undertook almost all these interventions and occupations, although private groups sometimes joined. The major periods were the expansion of the continental republic from 1811 to 1897, the war in Cuba and the apex of occupations (1898–1933), the Good Neighbor years (1934–1953), the Cold War (1954–1990), and the post-Cold War period (1991–2018 and ongoing). Scholars of these events have become increasingly critical and diverse, not only seeing them often as unnecessary brutal failures but also foregrounding extra-military aspects of these episodes, such as economics, race, and gender.