The Second Seminole War, also known as the Florida War, was a conflict from 1835 to 1842 in Florida between the United States and groups collectively known as Seminoles, consisting of Native Americans and Black Indians. It was part of a series of conflicts called the Seminole Wars. The Second Seminole War, often referred to as the Seminole War, is regarded as "the longest and most costly of the Indian conflicts of the United States".