Colorado has had Hispanics (beginning with those of Spanish origin from Spain) going back to the late 16th century.  Many of the people who you would call "Mexican" have been here probably longer than your ancestors and bring a great deal of culture to our state - and a majority who are immigrants came here legally.  

The solution is for those who have been here for years and are NOT documented but have legal citizen children and/or spouses to have a path to citizenship and after that happens we can enforce at the workplace and start fining the @@#$#$ out of business owners who knowingly hire them.  Take care of those here first who have become model "citizens" without papers.  My opinion.