slavery
There were several, but I bet the one you're thinking of was slavery.
Representation in Congress
Interstate compacts were formed to settle regional issues. States have to acquire the consent of Congress in order to form a compact.
The delegates at the Constitutional Convention chose to put off the slavery issue primarily to ensure the unity of the states and facilitate the ratification of the new Constitution. Many feared that addressing slavery directly would lead to deep divisions and potentially jeopardize the fragile alliance between Northern and Southern states. They believed that the issue could be resolved later, underestimating the growing tensions surrounding slavery that would ultimately lead to conflict. However, rather than becoming easier to settle, the issue escalated over time, culminating in the Civil War.
The delegates settled on a federal form of government instead of a system in which power was not divided between state and national government because they believed that it provided for a much stronger national government with a chief executive (the president), courts, and taxing powers.
slavery
There were several, but I bet the one you're thinking of was slavery.
hii this is my answer
Representation in Congress
dumb stuff
delegates at the constitutional convention of 1787 agreed to the three-fiths compromise as a way slaves were counted in determining a state's congressional delegation.
The Constitutional Convention exceeded its authority in writing a new Constitution and it was feared that if deliberations on a new Constitution were to be found out, the Convention would be dissolved. The Convention was supposed to work out amendments to the Articles of Confederation that would keep that document in effect but improve on its inherent weaknesses. It was soon apparent to the delegates that saving the Articles of Confederation by amendment was hopeless, so they began to create a new form of government entirely. This was a task, the delegates had no authority to do.
hii this is my answer
they had the civl war
Slavery
The Three-fifths Compromise
The Three-fifths Compromise