They needed slaves to work on their plantations.
slaves
No, a large majority of the southern population did not own slaves. In fact, only a small percentage of white families in the southern states owned slaves during the antebellum period.
Southern states wanted to count slaves as part of their populations for the purpose of representation in the United States Congress. By counting slaves as part of the population, southern states could increase their representation in Congress, despite slaves not having the right to vote.
Slaves represented a sizeable percentage of the population of the antebellum south. In the lower south, slaves represented 47% of the population. The total percentile in the upper south was 29%. The border states had a population of 13% of slaves against the total population.
The Southern states in the United States wanted slaves to count in their total population for representation in Congress. This led to the Three-Fifths Compromise in the Constitution, where slaves were counted as three-fifths of a person for the purpose of determining representation in the House of Representatives.
Enslaved African Americans composed about one third of the population of the southern states before the American Civil War.
The northern states didn't have slavery as the southern states did, and they were smaller. They were afraid that if slaves were counted as part of the population that would give the southern states an advantage when they were represented in Congress. In 1790 35% of the population in VA was slave, so that can make a difference in the balance of power between states.
One-Half Compromise was the compromise that dealt with the Northern States concern of the Southern States using slaves as part of the counted population thus influencing their representation in Congress.
To get both the northern and southern states to agree to it. The southern states wanted slaves counted in the population for determining representation in Congress (even though slaves couldn't vote). The northern states wanted them excluded.
South Carolina and Mississippi.
The six southern states with the largest areas where slaves made up more than 50% of the population were South Carolina, Mississippi, Louisiana, Alabama, Florida, and Georgia.
Although slaves couldn't vote, the Southern states wanted to count them for the purpose of increasing their representation in the House of Representatives. The Northern states didn't want to count slaves at all because the South insisted slaves were property and not persons. The Three Fifths Compromise was was just that...a compromise that allowed the South to count three-fifths of the slaves towards their total population which ultimately gave the South greater representation in congress than they would otherwise have had.