Centrist wonks lament party polarization, but rarely point out that it’s not something that just happened. In the context of heterogeneous political geography and malleable district boundaries, a two-party system doesn’t yield the centrism it is often credited with, but a superficial and artificial polarization that demands an eventual populist response. Party polarization is the endogenous and predictable result of incentives created by a first-past-the-post voting system susceptible to gerrymandering.