Answer: Because each state was looking out for its personal interests in regard to representation in Congress.
Details:
The Great Compromise and the Three-Fifths Compromise both focused on the representation of states in Congress. Both of these compromises were devised during the United States Constitutional Convention in 1787.
The Great Compromise resolved a dispute between small population states and large population states. The large population states wanted representation in Congress to be based on a state's population size. The smaller states feared this would lead to unchecked dominance by the big states; they wanted all states to receive the same amount of representation. The Great Compromise created a bicameral (two-chamber) legislature. Representation in the House of Representatives would be based on population. In the Senate, all states would have the same amount of representation, by two Senators.
The Three-Fifths Compromise was a way of accounting (somewhat) for the population of slaves in states that permitted slavery. For taxation and representation purposes, the question was whether slaves should count in the population figures. (They were not considered voting citizens at that time.) The Three-Fifths Compromise said that three out of every five slaves could be counted when determining a state's population size for determining how many seats that state would receive in the House of Representatives.
The Union of Soviet Socialist Republics later dissolved into fifteen independent countries in 1991.Three of the them, Estonia, Latvia and Lithuania declared their independence even before the demise of USSR in September 1991. The basic on USSR countries are here!
