About 2 years ago my husband had to go to Brownsville on business. I went with him. We decided to go across the border into Matamoros, Mexico. We were walking through some side streets trying to find the tourist part of town. Men kept coming out of doorways trying to get us to buy stuff from their shops. We kept telling them no, and walked on. Some guy got mad, and said, "Don't forget 911." He started laughing and went into his shop. The look on his face sent a chill straight through me. I started loudly asking my husband if he heard what that guy said. I kept saying, "Did anybody just hear that guy?" I was the only one that heard him. He did look hispanic, but he also looked Arabic. His English was broken. I use to work in a large health clinic that was at least 80% hispanic clients. I know spanish (well, when I hear it) and broken spanish. There was something off with his "spanish." It creeped me out so bad that we caught the first "taxi" back to the border. My husband reported it. (Never heard another word.)
That was a real eye opener for me. It was THE thing that made me really know we had to do something about our borders. I was also stunned with the difference in going into Mexico and entering the US. All I can say is, go see for yourself.