Up Against the WallUsing the U. S. wall at the border with Mexico as a focal point, two experts examine the global surge of economic and environmental refugees, presenting a new vision of the relationships between citizen and migrant in an era of Juan Crow, which systematically creates a perpetual undercaste. Winner, National Association for Ethnic Studies (NAES) Outstanding Book Award, 2017 As increasing global economic disparities, violence, and climate change provoke