OTHER NATIONS. THE U.S. COULD INTERVENE WHENEVER AMERICANS CONSIDERED IT NECESSARY TO PROTECT ITS CITIZENS OR PROPERTY. THE U.S. WOULD CONTROL A NAVAL BASE AT GUANTANAMO BAY . -BY THE FORAKER ACT OF 1900, THE U.S. SET UP A GOVERNMENT FOR PUERTO RICO. IN 1917, PUERTO RICANS BECAME AMERICAN CITIZENS. -FOR MORE