What was the relationship between U.S. industrialization and the large wave of Irish immigration of the mid-1800s?

Between 1815 and 1865 the United States experienced a significant boom in immigrants from Europe.  Approximately one-third of these immigrants came from Ireland.   Ireland had experienced a massive potato famine and this proved to be a push factor for many. Many of these immigrants were very poor and usually settled at their point of arrival in the cities along the East Coast.  Many of these cities were full of factories where these immigrants were able...

Between 1815 and 1865 the United States experienced a significant boom in immigrants from Europe.  Approximately one-third of these immigrants came from Ireland.   Ireland had experienced a massive potato famine and this proved to be a push factor for many. Many of these immigrants were very poor and usually settled at their point of arrival in the cities along the East Coast.  Many of these cities were full of factories where these immigrants were able to find gainful employment. 

The mid 1880s was a time of rapid industrialization and urbanization as the cities swelled.  As new technologies were developed and working hours increased, factories were able to stay open longer.  The large supply of Irish labor provided cheap labor for the growing cities. The Irish immigrants were likely unskilled or semiskilled laborers.  

By the mid to late 1800s the light bulb and Bessemer process and steel would change the dynamics of city life. Steel would increase industrialization and the need for workers and the light bulb would allow for longer working hours thus increasing productivity.