TIGER/Line Shapefile, 2015, nation, U.S., Current American Indian Tribal Subdivision (AITS) National

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the
U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents
a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data
set, or they can be combined to cover the entire nation.

           American Indian tribal subdivisions are administrative subdivisions of federally recognized American Indian reservations/off-reservation trust lands or
           Oklahoma tribal statistical areas (OTSAs).  These entities are internal units of self-government and/or administration that serve social, cultural,
           and/or economic purposes for the American Indian tribe or tribes on the reservations/off-reservation trust lands or OTSAs.  The Census Bureau obtains the
           boundary and attribute information for tribal subdivisions on federally recognized American Indian reservations and off-reservation trust lands from
           federally recognized tribal governments through the Census Bureau's Boundary and Annexation Survey (BAS).  For the 2010 Census, the boundaries for tribal
           subdivisions on OTSAs were also obtained from federally recognized tribal governments through the Tribal Statistical Areas Program (TSAP).  Note that
           tribal subdivisions do not exist on all reservations/off-reservation trust lands or OTSAs, rather only where they were submitted to the Census Bureau by
           the federally recognized tribal government for that area.

           The boundaries for American Indian tribal subdivisions are as of January 1, 2013, as reported by the federally recognized tribal governments through the
           Census Bureau's Boundary and Annexation Survey (BAS).

           The boundaries for tribal subdivisions on OTSAs are those reported as of January 1, 2010 through TSAP.