@
independentone From the Wikipedia article
It has been leased from Cuba to the U.S., without expiry, since 1903 as a coaling station and naval base.[3] It is the oldest overseas American naval base.[4] Since 1974, the U.S. has paid the Cuban government an annual sum equivalent to $4,085 in 1934 dollars (approximately $96,018 in 2024) to lease the bay.[5][6]
But we were there earlier; when the Spanish-American War ended, Spain gave up Cuba in the Treaty of Paris of 1898, and we wanted to keep a military presence there. The Wikipedia article has a little more about this.