What is the primary topic of Article IV of the U.S. Constitution?

Article IV of the U.S. Constitution primarily addresses the relationship between states and the federal government as well as the relationships among the states themselves. It outlines several key aspects of federalism, including the requirements for states to respect one another’s laws, the process for admitting new states to the Union, and the authority of Congress to control federal lands and places. This article is crucial for establishing how states interact with each other and adhere to federal laws, making it the correct choice in identifying the main topic of Article IV.

The other options pertain to different subjects; for example, the President's powers are covered in Article II, while the Bill of Rights, which outlines individual liberties and limitations on government power, is found in the first ten amendments to the Constitution. The federal judiciary, specifically its structure and authority, is established in Article III. Each of these articles and amendments focuses on different aspects of the governance system set forth in the Constitution, highlighting the importance and unique function of Article IV in the context of federal and state relations.