The Plan for Government
A Guide to the Constitution 1787
Issue with Slavery
Slavery was an issue because they didn't know whether or not to count them as population or not. In the south they didn't view them as people but as property. The north viewed them as people but only until it gave the south an advantage over them. So they came up with a compromise called the three-fifths compromise were a slave counted as three/fifths of a person. This also protected slave trade for 20 years.