I live in California and have watched it happen over the past 40+ years. What’s incredible is the complete and utter ineptitude of our national Republican ‘leadership’ and their failure to effectively bring attention to situations like California, Michigan, and the other liberal messes across the country. You don’t even need to argue theory, you can simply point to what has happened when liberalism goes unchecked. And no one on our side has the cubes to stand up and say it, fearful that they will alienate Mexicans or fruits or freeloaders.
Gingrich does that. Watch his CPAC speech. He talks extensively about Detroit, and what the left has done to it.