The correct answer is B) The Louisiana Purchase had required that there be no slave states within the territory.
There was great concern about admitting Missouri as a slave state because the Louisiana Purchase had required that there be no slave states within the territory.
US Congress had passed the Missouri Compromise on March 3, 1820. Congress tried to put an end to the difficult issue of slavery. Missouri was admitted to the Union as a slave state, meanwhile, Main was admitted as a free state. US Congress was really concerned that the admission of Missouri as a slave state could affect representation in Congress and the balance of power between northern and southern states.
