Lawrence became home to large groups of immigrants from Europe, beginning with the Irish in 1845, Germans after the social upheaval in Germany in 1848, Swedes fleeing an overcrowded Sweden, and French Canadians seeking to escape hard northern farm life from the 1850s onward. A second wave began arriving after 1900, as part of the great mass of Italian and Eastern European immigrants, including Jews from Russia, Poland, Lithuania and neighboring regions. Immigration to the United States was severely curtailed in the 1920s with the Immigration Act of 1924, when foreign-born immigration to Lawrence virtually ceased for over 40 years.