Why would the architectural design of the missions change over time?
Reading 1 was compiled from James E. Ivey and Marlys Bush Thurber, “San Antonio Missions National Historical Park” (Bexar County, Texas) National Register of Historic Places Registration Form, Washington, D.C.: U.S. Department of the Interior, National Park Service, 1983; and the National Park Service visitor’s guide for San Antonio Missions National Historical Park.