What power does Congress have regarding immigration?

Congress has the power to regulate immigration, which stems from its constitutional authority to establish rules for naturalization and govern the admission of foreign nationals into the country. This regulation includes setting policies related to visas, residency, and the conditions under which individuals may enter or remain in the United States.

This power allows Congress to enact comprehensive immigration laws that address various aspects of immigration, such as family reunification, employment-based immigration, asylum processes, and illegal immigration. Through these laws, Congress effectively manages the flow of people into the U.S., balancing national interests, economic needs, and humanitarian commitments.

In contrast, the other options do not accurately reflect the scope of Congress's authority over immigration. Granting citizenship is a part of the broader regulatory framework but does not encapsulate the entirety of immigration law. The determination of visas is also a subset of broader immigration regulation, and the creation of laws about national holidays falls entirely outside of immigration power, focusing instead on domestic matters unrelated to the admission of foreign nationals. Thus, the correct response underscores Congress's comprehensive authority to shape immigration policy and law.