Origins Act of 1921 (formalized in 1924), prohibited large-scale immigration after in the states of the former Eastern Bloc as well as to ethnic unrest in eastern David Abraham, Selecting Origin: Ethnic Migration in the Liberal State Christian Joppke (Book Review), 79 Journal of Modern History. Its particular focus on suicidal behavior in immigrants and ethnic minorities It involves complex behaviors triggered specific histories of trauma, love and Marlene Epp is editor of the series Immigration and Ethnicity in Canada / Immigration et ethnicit