#==============================================================================================
#US state boundaries
#
#Source: 
#[1] Cartographic Boundary Files - Shapefile
#    US Census Bureau
#    https://www2.census.gov/geo/tiger/GENZ2018/shp/cb_2018_us_state_500k.zip
#    (Accessed on 13 November 2023)
#
#Licence: Public domain
#https://ask.census.gov/prweb/PRServletCustom?pyActivity=pyMobileSnapStart&ArticleID=KCP-4928
#=============================================================================================