They move to where the jobs are but the ones left behind without a big-city job have disproportionately large political power and disproportionately little education. Letting land vote was a generationally catastrophic mistake, the US has a political system suited for an agrarian/early-industrial/frontier society rather than an urban industrialized society that also happens to be hegemon of the world.

or they dont move, get angry and resentful, and want to upset the economics system.