The recent resurgence of overtly racist, nationalistic, and anti-immigrant sentiment in the United States and Europe demonstrates the increased salience of race, ethnicity, and documentation status in both regions. Drawing on boundaries and citizenship scholarship, I argue that the presumption of citizenship being synonymous with whiteness reflects both explicit and implicit boundaries drawn around citizens racialized as white, separating them from citizens and non-citizens of color who are racialized as domestic and foreign outsiders. To demonstrate these boundaries, I incorporate scholarly accounts and events of racialized anti-immigrant discrimination in policies, interpersonal interactions, and institutional structures in both regions.