Question

which statement best describes the reason why most northerners did not want slavery to spread into western territories?
a. antislavery laws could not be enforced in western territories.
b. the growth of slavery in the territories would shift the balance of power in congress.
c. slavery in the western territories would take away job opportunities in northern states.
d. new states could never be admitted if slavery was denied in the western territories.

Explanation:

In the context of U.S. history, the balance of power between free and slave states in Congress was a crucial issue. Northerners were concerned that if slavery spread to western territories and those territories became slave - holding states, the South (which supported slavery) would gain more political power in Congress. This could lead to policies that favored the interests of slave - holding states over the North.

• Option A: Antislavery laws could potentially be enforced in new territories as they became states, so this is not the main reason.
• Option C: Slavery in the western territories was more about agricultural labor (like cotton in the South) rather than directly taking jobs from the North which had a more industrial - based economy.
• Option D: New states could be admitted as free states (as seen with states like California), so this statement is incorrect.

Answer:

B. The growth of slavery in the territories would shift the balance of power in Congress.