The United States Navy (US Navy, USN) was the navy of the United States from 1797 (replacing the Continental Navy, 1775-1785) until 1934, when it was officially disbanded by the Union of American People's Republics and replaced by the American People's Navy. The US Navy at its height was one of the most powerful naval forces in the world, and was involved in the War of 1812 (1812-1815), the First American Civil War (1861-1865), the Spanish-American War (1898), World War I (1914-1918), and the Second American Civil War (1933-1936).
During the Second American Civil War, many of the US Navy's warships mutinied and joined the Communist forces, becoming the core of the American People's Navy. Other USN ships managed to escape and joined the new Philippine Navy and Puerto Rican Navy, joined other established navies such as the Royal Navy or Royal Canadian Navy, or operated independently as long as possible.