What a wonderful find. I am glad you brought that up. This is what I found on the list of Santuary Cities:
San Antonio, TX [Note: The Sanctuary status of San Antonio is disputed, being researched.] Says this list was last updated 8/12/07.
I am from Texas, although not originally from Houston and I find this remarkable. As long as I can remember, which is a long, long time, San Antonio has always had a very noticable Mexican flavor.
What you found may be worth looking into as San Antonio may be changing.
San Antonio may well have a ‘Mexican Flavor’, but it doesn’t mean that comes from illegal immigrants. There have been Spanish speaking people there since before Texas became a state. I’m suspect they don’t like illegal immigrants any more than the ‘Anglos’ do.