The Constitutional Convention, (Philadelphia, Pennsylvania May-September 1787) was held to revise the Articles of Confederation after independence from Great Britain, which really intented to create a new government instead of fixing the old one.
The Three-Fifths Compromise in which three-fifths of the enumerated population of slaves would be counted for representation purposes regarding both the distribution of taxes and the apportionment of the members of the United States House of Representatives.
The Connecticut Compromise Its main contribution was in determining the method for apportionment of the Senate and retaining a federal character in the constitution.