The connection of the trail supported trade and movement between the colonial territories of Spain and France, and later, the movement of U.S. settlers heading west. Moses Austin headed west to San Antonio along El Camino Real de los Tejas, seeking to establish a colony in Spanish Texas.

El Camino Real de los Tejas was the "Royal Road" that served as the primary lifeline for the Spanish colonization of Texas and Louisiana starting in the late 17th century. It was critical because it connected Mexico City to the easternmost Spanish frontier at Los Adaes, allowing for the movement of soldiers, missionaries, and supplies needed to maintain a presence against French incursions. The road was more than a single path; it was a network of indigenous trails that facilitated the establishment of missions and presidios (forts), which were intended to "civilize" and convert the local Caddo Indians. It served as a conduit for cultural exchange, trade, and livestock drives that shaped the demographic landscape of Texas. Without this overland artery, the isolated Spanish outposts in East Texas would have likely collapsed due to supply shortages and the vast, "treacherous" distances between settlements.