The amount of immigrants arriving in the United states tripled each year, to about 170 000.
In 1850 Americans first measurable anti-immigrant feelings began to take root.
Immigrants crossed the ocean on board the large and steam-powered ship made in 1880.
During 1870 to 1920, the urban population grew from over 6 million to over 44 million.
many native-born Americans began to consider mass immigration a danger to the health and security of the country.