Napoleon Bonaparte sold French Louisiana to the United States in 1803, including all of Arkansas, in a transaction known today as the Louisiana Purchase. French soldiers remained as a garrison at Arkansas Post. Following the purchase, the balanced give-and-take relationship between settlers and Native Americans began to change all along the frontier, including in Arkansas. Following a controversy over allowing slavery in the territory, the Territory of Arkansas was organized on July 4, 1819. Gradual emancipation in Arkansas was struck down by one vote, the Speaker of the House Henry Clay, allowing Arkansas to organize as a slave territory.