Yup. The "two economies; two moneys" divide between urban coastal America & the Rust Belt / Deep South is probably one of the greatest silent threats to American security. Historically nation-states do not survive divides in regional inequality that are this big or this entrenched; the temptation grows for the rich region to secede and engage more with the global economy, while the resentment from the poor region builds and can lead to outright violence. And America's biggest defensive weapon, historically, has been two oceans: this doesn't apply when the potential enemies share a continent.