We have exclusion zones in the United States. Take for instance, southern New Mexico and southern Arizona. The government has even done to the extent to post signs warning people from hiking or camping in these areas. The illegals and drug runners have taken over these areas and it’s pretty sure you will be killed or kidnapped if you wander into what I call “Northern Mexico”.
You are 100% correct. "Northern Mexico', "Atzlan", what's the difference.