Question

in the early 1800s, most states in the north weretrying to spread slavery into the new territories.trying to grow their economies through agriculture.building industrial economies based on manufacturing.finding new ways to increase the availability of slave labor.

Explanation:

In the early 1800s, Northern states moved away from slavery and shifted to industrial manufacturing as their economic base, while Southern states focused on slave-based agriculture and pushed to expand slavery. The other options do not align with Northern practices of this era.

Answer:

building industrial economies based on manufacturing.