By 1500, the Arikara (or Ree) had settled in much of the Missouri River valley. European contact with the area began in 1743, when the LaVérendrye brothers explored the region. The LaVérendrye group buried a plate near the site of modern-day Pierre, claiming the region for France as part of greater Louisiana. In 1762 the entire region became part of the Spanish Louisiana until 1802. By the early 19th century, the Sioux had largely replaced the Arikara as the dominant group in the area.