The websites of United States Citizenship and Immigration Services and the United States Department of State display overviews of immigration laws. The Legal Information Institute of Cornell University and the American Immigration Council also discuss how these laws work.
Federal immigration law determines the obligations and rights of immigrants and how they attain residency or citizenship in the United States, according to Cornell University. Congress has the authority over who can enter, how long their stays are allowed and when they are required to leave.
The Immigration and Naturalization Act governs current immigration policies and allows an annual worldwide limit of 675,000 immigrants as of 2015, according to the American Immigration Council. Immigration laws in the United States are geared towards reuniting families, protecting refugees, promoting diversity and admitting people who are beneficial to the American economy.