Well, since we can’t stop them and can’t make them leave, then there’s nothing left to do but learn Spanish and embrace being North Mexico./s
Or you could make them learn English and get them to embrace being Southern USA. That’s the traditional American solution to mass immigration. It worked with English, Irish, Germans, Poles, Scandinavians and even with African-Americans, before folk like Sharpton realised they could make a fast buck out of race-baiting. E Plurubus Unum my friend.