Please explain specifically how this is "their" country? Please do......
One metric that you might use is the percentage of Hispanic population. Taking four year old data from the census, and you get:
Consider that this map is based on four year old census data and that the southern border is relatively porous then the question becomes if the majority of the people in a geographical area are from Mexico, what rights do the minority (US citizens) have to take action against the majority from Mexico?
Note that, for now, this is just a rhetorical question. Though, the trends are clear.
Note also that illegal immigration of Anglos from the US was a major factor in the Texas War for Independence (1835-1836).
Another rhetorical question, if a nation is negligent in enforcing it's border laws, does it forfeit the right to enforce those laws at a later time?
Understand, I am not arguing one side or the other. But I don't think that the current situation can be maintained over the long term...
Regarding in-state tuition, if a child meets the school's requirements for in-state tuition, I wouldn't have any issues with that ...
Uno