The US Census Bureau recently announced that it will use the 2010 Census’s separate racial and ethnic category questions for the 2020 Census (Fontenot 2018),1 disregarding research indicating that a single, combined race/ethnicity question would provide more accurate population data. Though US Census racial and ethnic category decisions are not its main concern, Nilda Flores-González’s timely book Citizens But Not Americans offers crucial insight into how such a decision, if approved, would underscore Latino millennials’ sense of estrangement from their homeland by miscounting or misrepresenting them. By examining Latino millennials’ self-understandings of race and belonging, Flores-González contributes to ongoing debates concerning conceptual distinctions between race and ethnicity, the transformation of the US color line, and the ethnoracial dimensions of citizenship. To set the stage for these contributions, which emerged from a careful analysis of 97 in-depth interviews with second-, third-, and fourth-generation Latino millennials in the Chicago area, Flores-González first documents how this group experiences exclusion and discrimination in public spaces that continue to be racially segregated. While signals such as dark skin and Spanish language use subjected some youths to more intense experiences of discrimination, all youths experienced exclusion in public white spaces due to a shared Latin American ancestry that marked them as “not white.” These experiences contributed to youths’ self-understandings of their de jure inclusion but de facto exclusion from full participation in American life. The remainder of the book documents how these self-understandings were manifest in youths’ understandings of their ethnoracial identity, their “racial middle” position within the US racial hierarchy, and their strategies to recast themselves as “real” Americans.