States cannot approve "green cards"...again, USCIS has sole jurisdiction.
States cannot protect illegals from deportation. If an Immigration Judge orders someone to be removed or deported, a state cannot override the ruling.
The state cannot offer work visas. The Department of State has sole jurisdiction to offer non-immigrant and immigrant visas.
When a company (or farmer) is willing to hire illegals, word gets out on the street real quick. It can attract hundreds (perhaps thousands) of illegals to certain geographic areas.
It may appear that your state government is making promises, but I'd really like to see evidence of that.