Since you have dual-citizenship, I’m assuming you can just come and go between the two countries as you please without dealing with visas. You shouldn’t have to get an I-9 or work visa if you have a Social Security number, and even if you don’t, there are ways around it since you are a citizen.
To be considered a resident of California for to get state tuition at the University of California branches, if not all California public universities, you have to have filed independent tax returns (i.e. your parents don’t claim you on theirs) for the previous two years before the year you are applying, and you must live in California full-time (not just during the school year) for a year before you start school, and generally show that you are serious about establishing residency… like you couldn’t go back to Canada during the summers to live with your family.
[University</a> of California - Admissions](<a href=“http://www.universityofcalifornia.edu/admissions/undergrad_adm/ca_residency.html]University”>http://www.universityofcalifornia.edu/admissions/undergrad_adm/ca_residency.html)
[Establishing</a> California Residence for Tuition Purposes, Office of the Registrar](<a href=“404 - Page Not Found”>404 - Page Not Found)
[CSUCI</a> > Records and Registration - California Residency FAQs](<a href=“California Residency for CSU Tuition Purposes - Admissions & Costs - CSU Channel Islands”>California Residency for CSU Tuition Purposes - Admissions & Costs - CSU Channel Islands)