admin1.map: An Administrative Level 1 map of every country in the world
Description
"Administration Level 1" is the generic term for the largest subnational administrative unit of a country. This
unit has different names depending on the country: for example, "state" in the USA and
"prefecture" in Japan. In this data.frame the country name is in the column
"admin" and the admin1 region name is in the column "region". Rather than working with this
object directly, consider using the helper functions listed below.
References
Taken from http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-admin-1-states-provinces/.
This is version 3.0.0 of the map and is considered to be beta.
The wikipedia page on "Administrative division": http://en.wikipedia.org/wiki/Administrative_division