Answer:
Under the Constitutional Convention, the states negotiated proportional representation and taxation with the Three-Fifths compromise.
Step-by-step explanation:
The Constitutional Convention of 1787 took place in the Old Pennsylvania State House, in Philadelphia with the purpose of revise and modify the Articles of Confederation (first written form of government of the United States), and ended up creating the United States Constitution, and establishing a stronger central government (federal government). One of the compromises made by the states was the Three-Fifths compromise, in which it was stated that three out five slaves would be counted in matters of representation and taxation.