Which article of the Constitution outlines the Legislative Branch?

The Legislative Branch of the United States government is outlined in Article I of the Constitution. This article establishes the framework for Congress, which is divided into two houses: the Senate and the House of Representatives. It details the powers and responsibilities of Congress, such as the ability to legislate, collect taxes, declare war, and regulate commerce among the states and with foreign nations.

Article I is essential as it not only describes how members of Congress are elected and the terms they serve but also specifies the legislative process, including how a bill becomes law. This clear delineation of the Legislative Branch's structure and function is fundamental to the operation of the federal government, highlighting the role of elected representatives in making laws that govern the country.

In contrast, the other articles outlined—Article II addresses the Executive Branch, Article III focuses on the Judicial Branch, and Article IV discusses the relations among states—serve entirely different functions within the Constitution’s framework.