In what years did the largest group of italians immigrate to the United States?

Answer 1

The years 1910 to 1920 were the high point of Italian immigration to the United States. Over 2 million Italians immigrated in those years

Answer 2

http://nhs.needham.k12.ma.us/cur/kane98/kane_p6_immig/italianII/rjs.html

The Italians are responsible for one of the largest exoduses in history, and a large amount of the Italian emigration flowed to the United States. From 1876 to 1924, more than four and a half million Italians arrived in the United States.