I don't think this is true at all. First example I found: http://caselaw.findlaw.com/us-supreme-court/403/365.html http://caselaw.findlaw.com/us-supreme-court/4

I don't think this is true at all. First example I found: http://caselaw.findlaw.com/us-supreme-court/403/365.html http://caselaw.findlaw.com/us-supreme-court/403/365.html A state restriction on welfare benefits for legal aliens violated the 14th amendment.