We contend that some people of color express anti-Black prejudice to cope with their own marginalization. Individuals stationed along an in-group’s periphery are often motivated to exclude others to bolster their own belonging in a community. Yet this process is sometimes triggered when individuals feel they are losing their marginal position. We examine these dynamics in the context of Latino prejudice toward Black individuals, with American as the in-group. Study 1 shows stronger American identity among Latinos is associated with anti-Black racism, which then correlates with weaker support for Black-centered policies. Studies 2 and 3 induce Latinos to feel more American, which sometimes increases anti-Black prejudice and decreases support for pro-Black policies. Study 4 causes Latinos to feel less American, which powerfully heightens anti-Black racism and drastically undercuts support for Black-centered policies. These patterns are generally conditioned by ideology, with liberal Latinos exhibiting more sensitivity to their rank as American.