The Second Seminole War, also known as the Florida War, was a conflict from 1835 to 1842 in Florida between various groups of Native Americans collectively known as Seminoles and the United States, part of a series of conflicts called the Seminole Wars. The Second Seminole War, often referred to as the Seminole War, was the most expensive Indian War fought by the United States, and lasted longer than any war involving the United States between the American Revolution and the Vietnam War.