Final answer:
East Texas Mission, or Mission San Francisco de los Tejas, would be located near Weches, Texas in modern times, a significant site in Texas history.
Step-by-step explanation:
The East Texas Mission, also known as Mission San Francisco de los Tejas, would be located near the modern city of Weches, Texas, today. The mission was established in 1690 as the first Spanish mission in the province of Texas, which is a vital part of the Texas history. While not directly mentioned in the context provided, historical records and information on early Spanish missions in Texas suggest that East Texas Mission would be located in this region.