 The following year, General Andrew Jackson invaded Florida with an army that included more than 1,000 Lower Creek warriors; they destroyed Seminole towns and captured Pensacola.Jackson's victory forced Spain to sign the Adams–Onís Treaty in 1819, ceding Florida to the U.S.In 1823, a delegation of Seminole chiefs met with the new U.S. governor of Florida, expressing their opposition to proposals that would reunite them with the Upper and Lower Creek, partly because the latter tribes intended to enslave the Black Seminoles.