Shape Shifters presents a wide-ranging array of essays that examine peoples of mixed racial identity, from the Roman and Chinese borderlands of classical antiquity to medieval Eurasian shape shifters, Native peoples of the missions of Spanish California, and African Americans in the post-civil rights era. At different times in their lives or over generations in their families, racial shape shifters have moved from one social context to another. And as new social contexts were imposed on them, identities have even changed from one group to another. Moving beyond the static either/or categories of racial identification found within typical insular conversations about mixed-race peoples, Shape Shifters explores these mixed-race identities as fluid, ambiguous, contingent, multiple, and malleable. With contributions by Ryan Abrecht, George J. Sánchez, Laura Moore, and Margaret Hunter, among others, Shape Shifters explores the forces of migration, borderlands, trade, warfare, occupation, colonial imposition, and the creation and dissolution of states and empires to highlight the historically contingent basis of identification among mixed-race peoples across time and space.