How did the largest wave of the Irish and German immigration impact life in US?

The largest wave of Irish and German Immigration in the 19th century significantly shaped American society by contributing to its cultural diversity and workforce. Irish immigrants often filled low-wage jobs, particularly in urban areas, while Germans brought skilled labor and established communities that influenced agriculture and brewing industries. This influx also led to tensions and nativist sentiments, as established Americans reacted to the changing Demographics. Overall, their contributions helped lay the foundation for modern American culture and economy.