The invention of the Commode perhaps?
Lucius Aurelius Commodus
(AD 161 - AD 192)
Actually the parallels between Commodus (185 AD) and Obama are scary! I can see where the US would have a temporary reprieve of its fall as the Roman Empire did when Constantine The Great took power in 310 AD but the writing was already on wall. I can not see the US (as it is today) going past 2100! I can see it fragmenting (like the Roman Empire did in the Third Century)!