1836: Arkansas became the 25th state. Native Americans first inhabited the state and created a thriving culture along the Mississippi River around 500 A.D. In the sixteenth and seventeenth centuries, both the Spanish and the French explored the region. The United States acquired the land from France as part of the Louisiana Purchase in 1803. Arkansas' image has been shaped by many different forces; its physical geography probably had the greatest impact during the state's early development. Major migration routes to the West Coast bypassed the area so that Arkansas remained less densely populated, predominantly rural, and without a major urban area for the first 150 years of its existence as a territory and state. (Source: Library of Congress)