Latino Americans have historically mobilized in response to anti-immigrant policies and rhetoric, but what occurs when they increasingly adopt and express their American identity? Why do some Latinos hold anti-immigration attitudes that undermine the foundations of Latino unity? This study extends Social Identity Theory by introducing social expression as a new stage in identity adoption. It examines the relationship between a Latino's social expression of their American or Latino identity and their stance on immigration. The results reveal a significant correlation between the comfort in expressing an American identity and support for anti- immigration policies, while no such relationship exists for the expression of a Hispanic identity. These findings challenge the strength of Latino identity and highlight the political implications of an American identity among Latinos.