What plan suggested a two house legislature in the national government?

The plan that suggested a two-house legislature in the national government is known as the Great Compromise or the Connecticut Compromise. Proposed during the Constitutional Convention of 1787, it established a bicameral legislature consisting of the House of Representatives, with representation based on population, and the Senate, which would have equal representation from each state. This compromise was crucial in balancing the interests of both large and small states in the formation of the United States Constitution.