I am familiar with this historian's work. Keep in mind, however, that he is speaking of democracy. Not all republics are democracies. Ours wasn't designed as one, but it has evolved into one. He is right, though, that once you have universal suffrage, the republic is lost. It's just a matter of time. Posts in a republic ought only be elected by those with a stake in preserving liberty. The Founders had it right when only property owners held the voting franchise. Property depends on liberty. Property owners are the only members of a society with a stake in continued liberty. Those without property will, quite naturally, vote for whomever will promise to cut away at property rights so as to make way for continually greater degrees of collectivism. With the loss of liberty comes the end of the rule of law. With the end of the rule of law comes lawlessness, and with lawlessness comes despotism, i.e., those in power (by now thoroughly corrupted by collectivism) will crack down with a police state in order to maintain control of the population. Next comes total collapse and revolution. It is likely that our fate was sealed when the voting franchise was loosed from property ownership and made universal.