How did the nature of immigration to the US change during the late 1800's?
They worked on the railroads and helped economics
In the late 1800s and early 1900s what was the difference between new immigration and old immigration?
Well the irish immigration came in three waves. The first and second "wave" came after 1717. Then the last (3rd) wave was in the mid 19th century (1840s). But the majority of the Irish Immigration was during the 1800s. From about 1841-1850 the U.S recorded 780,719 Irish immigrants. The number is a rough calculation but its probably close.