The Immigration Act of 1924 limited the number of immigrants allowed entry into the United States through a national origins quota. The quota provided immigration visas to two percent of the total number of people of each nationality in the United States as of the 1890 national census. It completely excluded immigrants from Asia.
Immigration Act sought to dramatically reduce immigration to the United States
In 1917, the U.S. Congress enacted the first widely restrictive immigration law. The uncertainty generated over national security during World War I made it possible for Congress to pass this legislation, and it included several important provisions that paved the way for the 1924 Act. The 1917 Act implemented a literacy test that required immigrants over 16 years old to demonstrate basic reading comprehension in any language. It also increased the tax paid by new immigrants upon arrival and allowed immigration officials to exercise more discretion in making decisions over whom to exclude.