The United States Navy was established on October 13, 1775, during the American Revolutionary War to protect American interests at sea. Initially, it consisted of a few ships and sailors, but it grew significantly as the nation expanded. The Navy played crucial roles in various conflicts, including the War of 1812, the Civil War, and both World Wars. Throughout its history, the Navy has evolved with advancements in technology, transitioning from wooden sailing ships to modern aircraft carriers and submarines. The Navy's mission includes maintaining maritime security, supporting national defense, and providing humanitarian assistance during crises.