Treaty of Madrid (1795)

Pinckney's Treaty, also commonly known as the Treaty of San Lorenzo or the Treaty of Madrid, was signed in San Lorenzo de El Escorial on October 27, 1795 and established intentions of friendship between the United States and Spain. It also defined the border between the United States and Spanish Florida, and guaranteed the United States navigation rights on the Mississippi River. With this agreement, the first phase of the on-going border dispute between the two nations in this region, commonly called the West Florida Controversy, came to a close.

The treaty's full title is Treaty of Friendship, Limits, and Navigation Between Spain and the United States. Thomas Pinckney negotiated the treaty for the United States and Don Manuel de Godoy represented Spain. It was presented to the United States Senate on February 26, 1796, and, after debate, was ratified on March 7, 1796. It was ratified by Spain on April 25, 1796 and ratifications were exchanged on that date. The treaty was proclaimed on August 3, 1796.

In 1763, Great Britain established two colonies—East Florida and West Florida—out of territory along the northern Gulf of Mexico coast taken from France and Spain following the French and Indian War(the Seven Years' War). From Spain the British received all of Spanish Florida, and from France received the portion of French Louisiana east of the Mississippi River – New Orleans plus all of French Louisiana west of the Mississippi had been secretly given to Spain the previous year. Both East and West Florida, never extensively colonized by the British, were ceded to Spain (who subsequently ruled both provinces as separate and apart from Louisiana) in the 1783 Treaty of Paris at the end of the American Revolutionary War. When this transaction was made however, the boundaries of West Florida, which had changed while under British sovereignty, were not specified.

...
Wikipedia