Britain and Spain During the American Revolution
The British had divided Florida into East and West Florida, so along with Nova Scotia, Great Britain had sixteen American colonies. While the War for American Independence was raging to the north, the Spanish, under General Bernardo de Gálvez , the governor of Louisiana, were attempting to harass the British on their western frontier.
Gálvez captured Baton Rouge, Natchez, and Mobile, all in British West Florida. After losing Pensacola to the Spanish, the British were afraid that the Spanish might make plans to capture St. Augustine by trying the same plan the British had tried-- coming up the Matanzas River and attacking from the rear. However, such plans were never executed.
On September 3, 1783, the Second Treaty of Paris ended the American Revolution and returned Florida to the Spanish. This time, however, most of the population, who owned businesses and plantations, did not leave. With so many British remaining in Florida, and very few Spanish returning, the character of this Spanish colony changed, leading to the eventual takeover by the United States.