A map showing the territories of the Viceroyalty of New Spain in 1800 that were gradually annexed by the United States of America over the course of a century and what parts of New Spain were the Republic of Mexico only a century later.
Own work
This file was derived from:

 Viceroyalty of New Spain and the United States of America 1800.svg
Former territories of New Spain lost to the USA by 1900.svgInformation from:

Requested by and knowledge from Donald Trung
Goran_tek-en