The number of unauthorized immigrants has grown since from both Central America and Asia. There were 1. This growth was fueled mainly by immigrants from the Northern Triangle nations of El Salvador, Guatemala and Honduras.
The number from Asia, 1. At the same time, the number of unauthorized immigrants from South America and Europe decreased between and Other large regions the Caribbean, Middle East-North Africa, sub-Saharan Africa and the rest of the world did not change significantly during that time. The U. Between and , the number of unauthorized immigrant workers fell by ,, as did their share of the total U.
In , this group accounted for 4. From to , individual states experienced different trends. In five states, the unauthorized immigrant population rose over the same period: Louisiana, Maryland, Massachusetts, North Dakota and South Dakota.
A rising share of unauthorized immigrants have lived in the U. A declining share of unauthorized immigrants have lived in the U. In , unauthorized immigrant adults had lived in the U.
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Pew Research Center does not take policy positions. Due to prolonged questioning, some immigrants were detained for months, or even years. Hsu , a professor of history at the University of Texas at Austin. At the time, Chinese people worked in gold mines, factories, railroads, and agriculture, especially on the West Coast. Although these immigrants made up only. To placate economic and racial anxieties, the radical exclusion act banned almost all immigration from China, making only a few exceptions for special groups like students and diplomats.
In addition, the Immigration Act passed that same year banned people who were poor, mentally ill, or convicted of crimes from entering the country. Asian exclusion continued with the Immigration Act , which banned all people who could not become naturalized citizens per the Naturalization Act.
That naturalization law had originally said that only free white people could become naturalized citizens. Yet by , previously excluded groups like Mexicans, black Americans, and Native Americans had won citizenship rights, and the law really only applied to Asians.
But the biggest change the act made to immigration policy was introducing numerical caps or quotas based on country of origin. These quotas gave enormous preference to people from northern and western Europe over those from southern and eastern parts of the continent.
But according to Mae M. The quota system remained largely in place until the s, when a new law established a new system. Each year, there is a cap on the total number of visas that the U. According to U. Citizenship and Immigration Services, the U. Before this change in , there had been no numeric caps on immigration within the Americas.
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