Earth is made up of vast tectonic plates that move together and apart over millions of years. Politics can be thought of in the same way, vast plates of ideology converging during periods of national greatness and shifting apart during periods of discord. What brings people together is the willingness to sacrifice for the common good, perhaps to face a great peril or to advance a great cause. In this period of growing political separation, we could possibly unite over war but it’s hard to see this country ever coming together for a great cause. Those days lie behind us.