America in the Time of Empire

All great empires and nations decay from within. By the time they hobble off the world stage, overrun by the hordes at the gates or vanishing quietly into the pages of history books, what made them successful and powerful no longer has relevance. This rot takes place over decades, as with the Soviet Union, or, even longer, as with the Roman, Ottoman or Austro-Hungarian empires. It is often imperceptible.