The Pecos, Colorado, Brazos, and Rio Grande were just a few of the major that the various people built their villages around or used for daily existence.

Rivers?

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

mapmaking. cartography had been an art form for many years, but it wasn’t until the renaissance when ptolemy’s ancient system of latitude and longitude was rediscovered that mapmakers were able to make surprisingly accurate and useful maps.