What were the four eras of immigration

1607-1830 the first Colonial settlements in Jamestown and Plymouth, 
1830-1880 were primarily Irish and German to the United states, 
1890-1920 the foreign-born had swollen to 15% of the US population,
and 1900 -1970 the USA in the middle of the 20th century growing businesses had to look inside America for new sources of labor. 

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