California is having their own Flint, Michigan situation
Previous generations of Americans paid for and did the work to create what was, at the time, a great infrastructure. They built the dams, bridges, schools, court houses, hospitals, etc.
We built our great economy and lifestyle assuming that the infrastructure would always be there. Monies (i.e. tolls, usage fees, taxes, etc), allocated to maintenance, was siphoned off and placed in the general treasury to provide services and tax relief.
When we had a strong tax base (i.e. large numbers of well paying jobs), the potential existed to fix our infrastructure problems. However, now that many of those jobs have been lost to outsourcing, off shoring, etc., our ability to finance the fixes to our aging infrastructure is greatly diminished. As a result, our economy will falter and our lifestyle will degrade.
Trump appeals to a lot of people even though some wouldn't admit it publicly. He has correctly identified the solution to the problem: immigration (legal and illegal), globalization, free trade and insufficient tax revenue. Other candidates, because of their funding sources, only want to deal with a piece of the solution.
Unfortunately, Trump, is the wrong messenger to deliver the solution. Cloaking the solution in nativist, xenophobic language obscures the message and offends the sensibilities of many would-be supporters.
Unless we get immigration, globalization and free trade under control and start to increase our tax base by bring back good paying jobs, imposing a temporary wealth tax, we're toast.