Industrialization - the United States was primarily a farming country up to the Industrial Revolution. With industrialization came a total switch in the types of jobs people performed. Working in a factory or an office is completely different from working a farm.
Immigration - with all these new factory jobs being created the need for cheap almost expendable labor was required. Industries knew this and encouraged immigration; immigrants knew this and flocked to America to work the factories for a decent wage (at least to them). Native-born Americans didn't like this - immigrants took their jobs, and at lower wages!
Urbanization - in the reverse of farming communities, great cities arose surrounded by factories and offices. The jobs were there, but the pollution spewed by industry and the low wages paid was not much of an improvement over dirt-poor farming.
On the whole, the switch from an agrarian society (farming) to an industrial society (big factories in big cities) played havoc with American life. Hope this helps a lot by By Hugi445:)
Hitler gained so much power by promising the Germans who have lost everything after the war with prosperity, jobs, and pride being a German. This is when the Nazis rose to power.
