The great European immigration wave to Argentina took place in the late 19th and early 20th century. It consisted mostly of Italian and Spanish immigrants, along with other nationalities such as Slavs (especially Ukrainians, Poles, and Russians), French, Germans, and Irish among others. During this period Argentina saw a huge increase in population. The European immigrants modified the politics of Argentina by introducing political movements from their source countries, such as labor unionism, anarchism and socialism.