How did immigration in the 1800's impact westward expansion and industrialization

The expansion and immigration of the late 1800s merged with this industrialization to provoke the growth of American urban society. As the needs of industrial workers became ever more important, the national political scene became dominated by the discrepancy in needs between America's rural and urban populations, as well as the needs of the new classes created by industrialization and the abolition of slavery.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.