boundaryID USA-ADM0-2_0_1-G591
boundaryISO USA
boundaryYear 2017.0
boundaryType ADM0
boundarySource-1 "US Census"
boundarySource-2 
boundaryLicense "Open Data Commons Attribution License 1.0"
licenseDetail 
licenseSource https://www.census.gov/about/policies/open-gov/open-data.html
boundarySourceURL https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html
boundaryUpdate 2020-01-16
downloadURL https://geoboundaries.org/data/geoBoundaries-2_0_1/USA/ADM0/geoBoundaries-2_0_1-USA-ADM0-all.zip