In which article of the Constitution is the legislative branch established?

The legislative branch of the United States government is established in Article I of the Constitution. This article outlines the structure and powers of the Congress, which consists of two houses: the House of Representatives and the Senate. It details the processes of lawmaking, the powers granted to Congress, and the regulations surrounding membership in each house.

Article I delineates important functions such as the authority to levy taxes, declare war, regulate commerce, and manage federal spending, establishing Congress as a central component of the federal government designed to represent the people and the states. The inclusion of such detailed provisions emphasizes the importance of the legislative branch in the framework of American governance, reflecting the principle of checks and balances intended by the framers of the Constitution.