Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The interactive map was created in R using the leaflet package [31] with base layer shapefile obtained from GADM, the Database of Global Administrative Areas (https://gadm.org/download_country40.html).
