Richard Lee of Virginia introduced the idea of the colony should declare themselves free and independent states.
He passed the famous Virginia Resolution which declared: “That these United Colonies are, and of right out to be, free and independent States, that they are absolved from all allegiance to the British Crown, and that all political connection between them and the State of Great Britain is, and ought to be, totally dissolved; that measures should be immediately taken for procuring the assistance of foreign powers, and a Confederation be formed to bind the colonies more closely together.”
Basically the south was more farmed based and as a result didn't have a lot of land that they could give up for factories and manufacturing buildings.
On the other side, the north was very industrialized and were able to produce mass goods which in return boosted their economy.
<u><em>Over time, its economic and military might waned and along with it, the empire's capacity to seize an opportunity. Add in civil unrest, natural disasters and powerful enemies such as the Arabs, Seljuk Turks, Bulgars, Normans, Slavs, and Ottoman Turks, and you can see why the Byzantine Empire eventually crumbled.</em></u>
If I remember correctly it was #2. The radical republicans wanted to punish confederate leaders so #3 is wrong. They did not want white southern representation in congress so #4 is wrong. And the democrats wanted to prevent freed slaves from owning land. Hope this helps!