 By the time the United States acquired the territory (1803) and Louisiana became a state (1812), the institution of slavery was entrenched.By 1860, 47% of the state's population were enslaved, though the state also had one of the largest free black populations in the United States.Much of the white population, particularly in the cities, supported slavery, while pockets of support for the U.S. and its government existed in the more rural areas.