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Yet, Spain aside, not one Hispanic nation, from which a plurality of our immigrants come, was among the top 40 in reading, science or math.

But these folks are going to come here and make us No. 1 again?

Is there greater “underclass behavior” among Hispanics?

The crime rate among Hispanics is about three times that of white Americans, while the Asian crime rate is about a third that of whites.

Among white folks, the recent illegitimacy rate was 28 percent; among Hispanics, 53 percent. According to one study a few years back, Hispanics were 19 times as likely as whites to join gangs.

What about Richwine’s point regarding “social trust”?

Six years ago, in “E Pluribus Unum: Diversity and Community in the 21st Century,” Robert Putnam, author of “Bowling Alone,” wrote that after 30,000 interviews he found that ethnic and racial diversity can be devastating to communities and destructive of community values.

In racially mixed communities, Putnam wrote, not only do people not trust strangers, they do not even trust their own kind.

“People living in ethnically diverse settings appear to ‘hunker down,’ that is, to pull in like a turtle … (to) withdraw even from close friends, to expect the worst from their community and its leaders, to volunteer less, give less to charity and work on community projects less often, to register to vote less, to agitate for social reform more but have less faith they can actually make a difference, and to huddle unhappily in front of the television.”

With the immigration bill granting amnesty to 12 million illegals, an open door to their dependents and a million new immigrants each year, almost all from the Third World, America in 2040 is going to look like Los Angeles today. Yet, it was in L.A. that Putnam found social capital at its most depleted and exhausted.

If Richwine is right, America in 2040 will be a country with whites and Asians dominating the professions, and 100 million Hispanics concentrated in semiskilled work and manual labor.

The issues Richwine raises go to the question of whether we shall survive as one nation and one people.

If our huge bloc of Hispanics, already America’s largest minority at 53 million, is fed by constant new immigration, but fails for a couple of generations to reach the middle-class status that Irish, Germans, Jews, Italians and Poles attained after two generations, what becomes of our “indivisible” nation?

Rather than face this question, better to purge and silence the Harvard extremist who dared to raise it.