Southerners still wanted slavery, they needed slaves to work in plantations and other jobs. even if Lincoln's ten percent plan went easy on the southerners, they refused to agree with the Union's ways. Which soon lead to Booth assassinating Lincoln. Reconstruction meant that they had to agree on the abolishment of slavery
The North was primarily fighting to abolish slavery while keeping the Union in tact. The North was upset when the South officially left the colonies, since it made them look weaker to other countries, as they themselves were on the brink of civil war. They did not want secession to be legal for this reason, but at the same time they did not agree with the South's view on slavery.
Answer:
Clause of the Constitution that said a slave would count as three-fifths of a person.
Explanation: