The weeks that follow a presidential election, when the outgoing President occupies himself with putting the finishing touches on his legacy while leaving it to the President-elect to put together the team that will take the reins of power, are usually a fallow period in US politics. Not this time.

This year marks the 50th anniversary of the Ethiopian Revolution, which began as an uprising against the semi-feudal despotism of Emperor Haile Selassie but would go much further, culminating in the abolition of...