The Spanish-American War was concluded with the Treaty of Paris, which was signed on December 10, 1898. This treaty gave the United States control over all of Spain's territories outside Africa, including three new American territories--Puerto Rico, Guam, and the Philippines. The United States paid Spain $20 million to acquire the Philippines. Spain also relinquished its claims to Cuba, which became a protectorate of the United States after the war. In the immediate aftermath of the war, Cuba was ruled by the United States Military Government, and in 1902, it formed its own government and became independent. However, the United States retained the right to intervene in Cuba and still controlled the lease to Guantanamo Bay. The Spanish-American War marked the end of Spain's colonial conquests and the beginning of the American quest to become a world power.