The U.S. started to become less diplomatic to Haiti under the presidency of Thomas Jefferson. Thomas Jefferson recognized that the revolution had the potential to cause an upheaval against slavery in the US not only by slaves, but by white abolitionists as well. Southern slaveholders feared the revolt might spread from the island of Hispaniola to their own plantations. Against this background and with the declared primary goal of maintaining social order in Haiti, the US, refused acknowledgement of Haitian independence until 1862.
The US also embargoed trade with the nascent state. American merchants had conducted a substantial trade with the plantations on Hispaniola throughout the 18th century, the French-ruled territory providing nearly all of its sugar and coffee. However, once the Haitian slave population emancipated itself, the US was reluctant to continue trade for fear of upsetting the evicted French on one hand and its Southern slaveholders on the other.
Jefferson is high in the running for worst person with the best PR in history.
Me when I was young: "Waoh Jefferson writes really prettily about liberty he must be a good guy"
Me getting into history and politics in my mid-teens: "What the fuck"