History of slavery in Louisiana History of slavery in Louisiana Following Robert Cavelier de La Salle establishing the French claim to the territory and the introduction of the name "Louisiana", the first settlements in the southernmost portion of Louisiana (New France) were developed at present-day Biloxi (1699), Mobile (1702), Natchitoches (1714), and New Orleans (1718). Slavery was then established by European colonists. The institution was maintained by the Spanish (1763–1800) when the area was part of New Spain, by the French when they briefly reacquired the colony (1800-03), and by the United States following the Louisiana Purchase of 1803. Due to its complex history, Louisiana
History of St. Louis (1763–1803) Louisiana to an egalitarian French government. In a show of strength, the Spanish governor sent a fleet of galleys and soldiers with military supplies to reinforce Spanish control of St. Louis. However, even while the Spanish colonial officials were trying to maintain control of Louisiana, the Spanish government was attempting to transfer the territory to France. The Spanish government secretly returned the unprofitable Louisiana territory to France in October 1800 in the Treaty of San Ildefonso. After a promise by French leader Napoleon Bonaparte not to sell Louisiana without giving Spain the right of first refusal, the Spanish officially transferred