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. Slavery became a wedge issue in Arkansas, forming a geographic divide that remained for decades. Owners and operators of the cotton plantation economy in southeast Arkansas firmly supported slavery, as they perceived slave labor as the best or "only" economically viable method of harvesting their commodity crops. The "hill country" of northwest Arkansas was unable to grow cotton and relied on a cash-scarce, subsistence farming economy. As European Americans settled throughout the East Coast and into the Midwest, in the 1830s the United States government forced the removal of many Native American tribes to Arkansas and Indian Territory west of the Mississippi River. Additional Native American removals began in earnest during the territorial period, with final Quapaw removal complete by 1833 as they were pushed into Indian Territory. The capital was relocated from Arkansas Post to Little Rock in 1821, during the territorial period. When Arkansas applied for statehood, the slavery issue was again raised in Washington, D.C. Congress eventually approved the Arkansas Constitution after a 25-hour session, admitting Arkansas on June 15, 1836, as the 25th state and the 13th slave state, having a population of about 60,000. Arkansas struggled with taxation to support its new state government, a problem made worse by a state banking scandal and worse yet by the Panic of 1837. Civil War and reconstruction In early antebellum Arkansas, the southeast Arkansas slave-based economy developed rapidly. On the eve of the American Civil War in 1860, enslaved African Americans numbered 111,115 people, just over 25% of the state's population. A plantation system based largely on cotton agriculture developed that, after the war, kept the state and region behind the nation for decades. The wealth developed among planters of southeast Arkansas caused a political rift between the northwest and southeast. Many politicians were elected to office from the Family, the Southern rights political force