The USA has always attracted immigrants, who were search of political and religious freedoom as well as economic opportunities.
The famine in Ireland in 1840 and industrialisation were a important causes for emigrting.
To control the overflow of immigrants, the Americans set up immigration centres as Ellis Island, which was open from 1892 to 1954, but in the 20th century the USA voted new laws to restrict immigration.
Now a green card is necesary live in America.
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