[A] Juan Lopez from Oaxaca is freely accepted as a U.S. citizen in a way that a white Bob Jones would never fully be embraced as a citizen of Mexico, a country whose constitution still expressly sets out racially chauvinistic guidelines that govern immigration law. Someone who appears African or European would have a hard time fully integrating as a citizen in Chinese, Korean, or Japanese society, in a way not true of Chinese, Koreans, and Japanese in America. The world assumes that in America a president, attorney general, secretary of state, or Supreme Court justice can be black; but it would be as surprised to find whites as high public officials in Zimbabwe as to find a black as prime minister or foreign minister in Sweden...

In more recent times, religious and racial diversity — in Rwanda, the former Yugoslavia, Iraq, or contemporary Nigeria — has resulted in chaos and, occasionally, genocide. True, some nations have been able to incorporate different tribes, as in the United Kingdom’s unification of the various peoples of the British Isles, but usually after hundreds of years of fighting and only when there were underlying racial and cultural affinities that could trump tribal differences.

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. Is there any evidence from the past that institutionalizing sects and ethnic grievances would ensure a nation’s security, prosperity, and freedom? America’s melting pot is history’s sole exception of e pluribus unum inclusivity: a successful multiracial society bound by a common culture, language, and values. But this is a historic aberration with a future that is now in doubt...

[W]ar can have utility and solve problems, and it often follows a grim logic of sorts; but once it starts, it may well last twenty-seven years over the entire Greek world rather than an anticipated thirty days in Attica and kill thousands at its end who were not born in its beginning. Such recognition is not necessarily cause for pacifism; rather... it calls for acceptance that thousands will end up rotten in little-known places... the logic that follows from decisions made far away in the hallowed assemblies...

America was born as an immigrant nation. It went through many periods of nearly unlimited immigration, coupled with xenophobic backlashes when particular groups — Germans, Jews, Irish, Mexicans, or Poles — came in such numbers and so abruptly that the traditional powers of assimilation were for a time overwhelmed. But the eras of ethnic ghettoes and tribal separatism were usually brief, given the inclusive popular culture and official government efforts to overwhelm identification with the home country.

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Those regions that Putin has already bullied into compliance — Georgia, Crimea, and eastern Ukraine — serve as a warning to others of what might be their fate should they resist, and why it is thus wiser to make the necessary adjustments. Should Vladimir Putin suddenly discover persecuted Russian speakers in Estonia, we know the script. He will give speeches about the historical ties of Estonia to Russia; he will list his worries about the supposed maltreatment of Russian speakers; he will warn the world that his Russia is a nuclear, and sometimes unpredictable, power and therefore the world should butt out.

My @HooverInst colleague @SWAtlasHoover has consistently warned that government must follow science, not politics, in doing the least amount of harm to its people. It's ironic that criticism directed at him has been done so in an unscientific fashion.

Europe's immigration policy is a disaster — and for reasons that transcend the idiocy of allowing the free influx of young male Muslims from a premodern, war-torn Middle East into a postmodern, pacifist, and post-Christian Europe. Europe has not been a continent of immigrants since the Middle Ages. It lacks the ingredients necessary to assimilate, integrate, and intermarry large numbers of newcomers each year: There is no dynamic and fluid economy, no confidence in its own values, no belief that class and race are incidental, not essential, to one's persona, no courage to assume that an immigrant made a choice to leave a worse place for a better one. And all this is in the context of a class-bound hierarchy masked and excused by boutique leftism.

In the last half-century, Americans have increasingly tended to emphasize race and tribe in promoting “diversity,” rather than seeking to strengthen the more tenuous notion of unity with their fellow citizens. We have forgotten that human nature is fond of division and must work at setting aside superficial tribal affinities to unite on the basis of core values and ideas.

A Latino-American undergraduate who is a student of Shakespeare is not "culturally appropriating" anyone’s white-European legacy, but instead seeking transcendence of ideas and a common humanity. Asian-Americans are not “overrepresented” at premier campuses. Their high-profile presence should be praised as a model, not punished as aberrant by number-crunching bureaucrats. African-Americans who excel in physics and engineering are not “acting white” but finding the proper pathways for their natural talents. Being one-half Southeast Asian or three-quarters white is not the touchstone to one’s essence and is irrelevant to one’s character and conduct. No one is impinging on anyone’s culture when blacks dye their hair blond, or when blondes prefer to wear cornrow braids. Campuses desperately need unity czars, not diversity czars. Otherwise, we will end up as 50 separate and rival nations — just like other failed states in history whose diverse tribes and races destroyed themselves in a Hobbesian dog-eat-dog war with one another.