Which amendment made Cuba an American protectorate and forced to cede Guantanamo Bay the U.S.?

No amendment made Cuba an American protectorate or forced it to cede Guantanamo Bay to the U.S.

The Platt Amendment, an appendix to the U.S. Army Appropriations Bill of 1901, enforced the terms of the Treaty of Paris (1898) that ended the Spanish-American War and effectively controlled U.S.-Cuban relations for three decades.