The volume contains papers presented at the fourth Workshop "American Ethnicity: Rethinking Old Issues, Asking New Questions" which took place in Krakow, Poland, on May 24th-25th, 2010. The event was organized by the Institute of American Studies and Polish Diaspora of the Jagiellonian University, and supported by the (American) Immigration and Ethnic History Society. The tradition of organizing bi-annual workshops goes back to 2004 and continues to be a forum for discussing ongoing research and sharing ideas. The texts included in this volume provide a comparative context to immigration studies, contribute to the gender perspective, bring up new issues and remind the most important aspects of migrants' life, such as remittances and poverty. There is also a set of the articles on American Jewish experience, studied from a variety of angles, and the Polish-American section presenting texts on local immigrant communities.