How did the constitution set up the legislature branch

Two Representative Houses

Beginning in 1781, the government of the United States operated under the Articles of Confederation. The Articles created a unicameral legislature, called Congress, without a separate executive and judicial branch The Legislative Branch. Established by Article I of the Constitution, the Legislative Branch consists of the House of Representatives and the Senate, which together form the United States Congress ... The Senate is composed of 100 Senators, 2 for each state.