Advocates and service providers who help immigrants become citizens say that the application fee for citizenship, now $680, is a barrier to naturalization for low-income immigrants. New research by Manuel Pastor and Jared Sanchez of the University of Southern California (USC) and Patrick Oakford of the Center for American Progress (CAP) shows that the number of low-income immigrants naturalizing is lagging that of immigrants with higher incomes. Read more at this post written for the New Americans Campaign.