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The Immigration and Nationality Act (INA) was enacted in 1952. Text - H.R.5678 - 82nd Congress (1951-1952): Immigration and Nationality Act | Congress.gov | Library of Congress
The INA collected many provisions and reorganized the structure of immigration law. The INA has been amended many times over the years and contains many of the most important provisions of immigration law. Immigration and Nationality Act | USCIS
The INA is contained in the United States Code (U.S.C.). The U.S. Code is a collection of all the laws of the United States. Title 8 of the U.S. Code covers "Aliens and Nationality."
Section 15 in 1952
The term "immigrant" means every alien except an alien who is within one of the following classes of nonimmigrant aliens................(The exceptions continue with over 900 words)
Whereas Section 15 currently
The term "immigrant" means every alien except an alien who is within one of the following classes of nonimmigrant aliens-............(The exceptions continue with over 4000 words)
Immigration and Nationality Act | USCIS
There are special situations where the law provides for foreign citizens to move to the United States. This includes the U.S. Refugee Admissions Program (USRAP), which is an inter-agency effort, the Department of Homeland Security and Department of State to increase the number of Iraqi refugees admitted to the United States.
In addition, Temporary Protected Status (TPS) is a temporary immigration benefit that allows qualified individuals from designated countries (or parts of those countries) who are in the United States to stay here for a limited time period. A TPS country designation may be based on on-going armed conflict, environmental disaster, or other extraordinary and temporary conditions in the country.