This polygon shapefile contains the first-level administrative divisions of United States (adm1). Level 1 divisions include states and federal districts. This layer is part of the Global Administrative Areas 2015 (v2.8) dataset. Hijmans, R. and University of California, Berkeley, Museum of Vertebrate Zoology. (2015). First-level Administrative Divisions, United States, 2015. UC Berkeley, Museum of Vertebrate Zoology. Available at: http://purl.stanford.edu/wm380qt3456 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.