Paraguay expedition
The Paraguay expedition (1858–1859) was an American diplomatic mission and nineteen-ship squadron ordered by President James Buchanan to South America to demand reparation for certain wrongs alleged to have been done by Paraguay (including firing upon a United States naval vessel), or seize its capital Asunción if this was refused. It has been described as "an incident so grotesque and dangerous" that escalated from "a series of minor misunderstandings".