Here is a list of pull factors as to why European immigrants to America during the late 19th and early 20th centuries:
1) Labor contracts- European immigrants were recruited by different American companies to come work for them. This guarantee of employment enticed many individuals to leave their homes.
2) Advertisement of cheap farmland- Many individuals wanted their own space and the ability to make themselves a living. Going to America to buy cheap farmland would afford them this opportunity.
3) Freedoms/Opportunity for a better life- America was advertised as a country where immigrants can start fresh and work hard in order to generate a new fulfilling life.