Answer:
Expansion lead to economic promise and fueled the manifest destiny but it also lead to sectional tension over slavery. The north contained a lot of abolitionists while the south was commonly pro-slavery, this increased sectional tension because each side wanted to see their ideals extended into the west.
The western expansion and the mexican-american war affect the sectional tensions between the north and south because the Mexican-American War open up the slavery-extension matter.
The rise of slavery in the antebellum period was exacerbated by the territories gained in the Mexican-American War of 1848. The Mexican War had its origins in the westward expansion of American immigrants and the annexation of the Texas Republic to the United States in 1845.
The sectional tension arose because the Mexican-American War reignited the debate over slavery extension that had raged between the North and South since the Missouri Compromise.
Therefore, the sectional tensions arsed due to the reopening of the issue of slavery expansion.
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