Is it true that Italians immigrated to the United States to avoid overpopulation and high taxes?

A very large number of Italian immigrants came to the United States at the turn of the Twentieth Century.  While every immigrant that decided to make the journey to the United States had a unique reason for moving, high taxes and overpopulation do not seem to be a major push factor.  The majority of Italians came to the United States to escape poverty and seek better economic opportunity.  Most of the new immigrants were poor rural laborers that worked on tenant farmers. Years of political turmoil, disease and natural disasters had created very poor conditions for the farmers of southern Italy.  Many Italians wanted to go to the United States, save enough money, and return to Italy to buy property so that they could operate their own farms.  Half of the millions of Italian immigrants returned to Italy.