Going to Texas: Five Centuries of Texas Maps

Despite the mathematical precision involved, cartography remains more art than science even in the twenty-first century as maps reflect disputed borders, names of states or cities or regions, and territorial aspirations. Maps serve a purpose, and the subject matter depicted tells us something about the motives of those who made and commissioned the maps.
Great Military Map of Texas (detail), 2006.
Maps of Texas, particularly the early ones, also say something about the countries claiming the land at the time the map was made. The Spanish and Mexicans used a measurement approximately three inches shorter than the one Americans used. Thus, three inches, multiplied by acres upon acres, inevitably created confusion and fostered disputes between individual land owners as well as nations.
Maps were also utilitarian in how they measured land. Neither the acre nor the hectar was the standard measure used in the eighteenth and nineteenth centuries. Instead, surveyors applied labors and leagues. A labor reflected the size of a parcel of land on which one could labor or farm, whereas leagues represented larger properties, such as those required for ranching.
Permiere Partie de la Carte de l'Interiure de la Louisiane, 1812.
(http://www.texasstudies.org/MapExhibition/Maps.htm)