The Great Compromise (also called the Connecticut Compromise) was worked out in the Constitutional Convention in 1789. The Compromise settled the debate over legislative representation between proponents of the Virginia and New Jersey Plans.
New Jersey Plan
This compromise established a bicameral legislature (Congress). The upper house (Senate) was to contain two votes per state, with Senators chosen by state legislatures. The lower house (House of Representatives) was based on population, with representatives chosen by the people. The Great Compromise also called for the Articles of Confederation to be completely replaced.