What is the focus of Article 4 of the U.S. Constitution?

The focus of Article 4 of the U.S. Constitution is indeed on the rights and powers of the states. This article addresses various aspects of the relationship between states and the federal government, including the full faith and credit clause, which requires states to recognize the laws and judicial decisions of other states. It also outlines the provisions for the admission of new states into the Union and guarantees a republican form of government in each state. This emphasis on the rights of states underlines the federal structure of the U.S. government, highlighting the balance of power between state and national authority. The other options pertain to different articles: the amendment process is covered in Article 5, the establishment of the Supreme Court is addressed in Article 3, and the duties of the President are outlined in Article 2.