Respuesta :

Two early actions taken to prevent the spread of slavery in the United States were the Northwest Ordinance of 1787 and the Missouri Compromise of 1820.

1. The Northwest Ordinance of 1787 established a government for the Northwest Territory and outlined the process for admitting a new state to the Union. Importantly, it also prohibited slavery in the Northwest Territory, which included the future states of Ohio, Indiana, Illinois, Michigan, and Wisconsin.

2. The Missouri Compromise of 1820 was an agreement that allowed Missouri to enter the Union as a slave state and Maine as a free state, maintaining the balance between slave and free states. It also prohibited slavery in the Louisiana Territory north of the 36°30′ latitude line, with the exception of Missouri.

These actions were significant in the early efforts to control the expansion of slavery and would shape the political landscape leading up to the Civil War.