This dataset contains the boundaries of the 11 states in the Big Ten Academic Alliance as of 2022. It was derived from the cartographic boundary files available on https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html. Data are generalized representations of geographic boundaries at 1:500,000.
Big Ten Academic Alliance Geospatial Information Network and United States. Bureau of the Census