Some southerners might feel that the Missouri Compromise favored the north because it allowed for the admission of Maine as a free state, while also allowing Missouri to enter as a slave state. This maintained the balance of free and slave states in the Union, but also limited the expansion of slavery into new territories, which may have been seen as detrimental to southern interests. Additionally, the compromise established a line at 36°30' latitude, with slavery prohibited north of this line in the Louisiana Territory. This could be perceived as favoring the north by limiting the spread of slavery into new territories.
