The majority of immigrants to the USA between 1820 and 1900 came from which two countries?

The majority of immigrants emigrating to the United States from 1820 to 1900's were Irish and German. Most of the Irish immigrants were escaping from the potato famine and lack of arable land, opportunity and economic crisis. This was also caused by penal law, where Irish Catholics were forced to accept that the Anglican Church from England was the main denomination. The Germans came en masse to the United States in the 1900's because of the revolts happening in various German states. Another wave of immigrants came from Germany, which were the German Jews. Many Germans settled in the southern part of the United States.