They hate you, White man.
Consider first how "our" government sues states like Arizona when said states try and enforce those national immigration laws that "our" federal government stubbornly refuses to enforce.
The excuse given is that "immigration is a national issue and localities cannot act independently on immigration." Of course, when localities decide to give out driver's licenses or in-state tuition to illegals, or to refuse to cooperate with federal detainment requests, or refuse to inform federal authorities when illegals are identified - activities which ALL encroach upon federal immigration prerogatives - for some mysterious reason, no lawsuits are issued.
Puzzling, it all is.