In the late 1840's, what led to the question of whether slavery should expand to the territories?

Athe enactment of the Wilmot Proviso
Bthe violence of “Bleeding Kansas”
Cthe results of the Mexican War
Dthe attack at Harpers Ferry

Verified Answer :

Answer: C. the results of the Mexican War

The consequences of the Mexican War during the late 1840's contributed to the issue of slavery at that time. The issue reached to the extent of debating whether slavery has to expand to other territories.