Victor Davis Hanson‘s latest column at National Review Online challenges conventional wisdom about the value of “diversity.”

Emphasizing diversity has been the pitfall, not the strength, of nations throughout history.

The Roman Empire worked as long as Iberians, Greeks, Jews, Gauls, and myriad other African, Asian, and European communities spoke Latin, cherished habeas corpus, and saw being Roman as preferable to identifying with their own particular tribe. By the fifth century, diversity had won out but would soon prove a fatal liability.

Rome disintegrated when it became unable to assimilate new influxes of northern European tribes. Newcomers had no intention of giving up their Gothic, Hunnish, or Vandal identities.

The propaganda of history’s multicultural empires — the Ottoman, the Russian, the Austro-Hungarian, the British, and the Soviet — was never the strength of their diversity. To avoid chaos, their governments bragged about the religious, ideological, or royal advantages of unity, not diversity.

Nor did more modern quagmires like Iraq, Lebanon, Syria, Rwanda, or Yugoslavia boast that they were “diverse.” Instead, their strongman leaders naturally claimed that they shared an all-encompassing commonality.

When such coerced harmony failed, these nations suffered the even worse consequences of diversity, as tribes and sects turned murderously upon each other.

For some reason, contemporary America believes that it can reject its uniquely successful melting pot to embrace a historically dangerous and discredited salad-bowl separatism.