2560px-White,_Gallaher_&_White_Mapa_de_los_Estados_Unidos_de_Méjico_1828_UTA-2

White, Gallaher & White map of the United States of Mexico.

White, Gallaher & White map of the United States and Mexico around 1840. Credit: Public Domain

White, Gallaher & White map of the United States of Mexico.