The United States occupation of Haiti began on July 28, 1915, when 330 U.S. Marines landed at Port-au-Prince, Haiti, after the National City Bank of New York convinced the President of the United States, Woodrow Wilson, to take control of Haiti's political and financial interests. The July 1915 invasion took place following years of socioeconomic instability within Haiti that culminated with the lynching of President of Haiti Vilbrun Guillaume Sam by a mob angered by his decision to order the executions of political prisoners. The invasion and subsequent occupation was promoted by growing American business interests in Haiti, especially the National City Bank of New York, which had withheld funds from Haiti and paid rebels to destabilize the nation through the Bank of the Republic of Haiti with an aim at inducing American intervention.

Port-au-Prince is the capital and most populous city of Haiti. The city's population was estimated at 1,200,000 in 2022 with the metropolitan area estimated at a population of 2,618,894. The metropolitan area is defined by the IHSI as including the communes of Port-au-Prince, Delmas, Cite Soleil, Tabarre, Carrefour, and Pétion-Ville.