What projected coordinate system are the GIS boundary data in?

What projected coordinate system are the GIS boundary data in?

Most NHGIS shapefiles use one of ArcGIS’s predefined projected coordinate systems for North America; either the USA Contiguous Albers Equal Area Conic, the Alaska Albers Equal Area Conic or the Hawaii Albers Equal Area Conic, as appropriate. Shapefiles for Puerto Rico use an Albers Equal Area Conic with central meridian, standard parallels and latitude of origin set to match the Puerto Rico State Plane Coordinate System’s

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