"Layering joy and urgent defiance -- against physical and cultural erasure, against white supremacy whether intangible or graven in stone -- Natasha Trethewey's work gives pedestal and witness to unsung icons. Monument, her first retrospective volume, draws together verses that delineate the stories of working-class African American women, a mixed-race prostitute, one of the first black Civil War regiments, mestizo and mulatto figures in casta paintings,...