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.
Explanation:
The confederates used very defensive tactics that allowed them to stay on home turf and win many small battles.
Answer: I think the answer is D. The announcement of the Emancipation Proclamation. Hope this helps!
