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Because of immigration.
We can not answer your question because you have not said which country's immigration policies you want to know about. All countries have immigration policies!
After World War ll , most people were suspected enemies, and most of them got held at Ellis Island.
LULA
Because the united states could only take in a certain amount of immigrants per year
The new immigration laws passed in the 1920s, such as the Emergency Quota Act of 1921 and the Immigration Act of 1924 (National Origins Act), were implemented to restrict and limit the number of immigrants entering the United States. These laws were largely driven by nativist sentiments, economic concerns, and fears of losing traditional American values due to the influx of immigrants from Southern and Eastern Europe. The laws favored immigrants from Northern and Western Europe while severely limiting immigration from other regions.
During the 1920s Congress put limitations on Immigration. The limitations slowed down the influx of millions of immigrants. 40 million people immigrated to the United States between 1880 and 1920.
Depressed crop prices, flourishing industries in urban areas, and strict Immigration controls from Asia and Europe brought about the demographic shifts of the 1920s.
The new laws in the 1920s, such as the Quota Acts of 1921 and 1924, established immigration quotas based on nationality, favoring Northern and Western European immigrants while limiting Southern and Eastern European immigration. This shifted the demographic makeup of immigrants entering the United States and aimed to restrict overall immigration levels.
Immigrants from northern and western Europe were "superior" to those from southern and Eastern Europe
During the 1920s Congress put limitations on Immigration. The limitations slowed down the influx of millions of immigrants. 40 million people immigrated to the United States between 1880 and 1920.
northern and western Europe
Immigratino restrictinos in the 1920s were designed to delay citizenship for newcomers to America and limit immigratino from southern and eastern Europe.
Nativism and racism increased in the 1920s and led to changes in Immigration laws.
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Immigration into the United States has been shaped by legislation greatly restricting Chinese immigration through the Chinese Exclusion Acts beginning in 1882. These were a series of laws first passed in 1882 that restricted Chinese from entering the United States. They were not repealed until 1943. Until the 1880s, most immigrants to the United States were from northern and western Europe, but in the closing years of the 19th century and the opening ones of the 20th, immigration from southern and eastern Europe increased tremendously. In response, Congress in the 1920s passed legislation that restricted total immigration and favored immigration from western and northern Europe. In the 1960s, Congress removed the discriminatory national origins quota system, and legal immigration, especially from Latin America, Canada, and Asia, started to increase. By the closing years of the 20th century and the opening ones of the 21st, immigrants were primarily coming from Latin America and Asia. Illegal immigration remains a serious problem and has not been solved.