What is the main duty of the President of the United States?

The main duty of the President of the United States is to enforce the laws. This responsibility is rooted in Article II of the U.S. Constitution, which outlines the powers and responsibilities of the executive branch. The President serves as the chief executive officer, meaning they are tasked with ensuring that the laws passed by Congress are implemented and followed across the nation.

This includes overseeing the various federal agencies and departments that carry out specific duties related to law enforcement and public administration. By enforcing the laws, the President plays a crucial role in maintaining order and upholding the Constitution, further ensuring that the government operates effectively and in accordance with the law.

Other roles mentioned in the options, such as making laws or interpreting laws, primarily belong to Congress and the judicial branch, respectively. The legislative branch is responsible for law-making, while the judicial branch interprets laws and resolves legal disputes. Thus, the focus of the President's powers clearly aligns with the enforcement of laws.