The three-fifths compromise was an agreement between Southern
and Northern states reached during the Constitutional Convention of
1787, during which the basic framework of the United States was
established. Under this compromise, slaves were counted as
three-fifths of a human being for the purpose of taxation and
representation in Congress. Southerns states were given more seats
in Congress and began to dominate the Presidency, the Speakership
of the House, and the Supreme Court in the period prior to the
Civil War.
The Great Compromise gave the states equal representation in the
Senate and representation to population in the House. It also
established the electoral college for electing the U.S. presideng.
The great compromise forbade Congress to abolish the slave trade
before 1808.