TB goes awry in the second step:
This post (which was about IQ, part of a larger issue of Civilization) seemed to me to be about the very foundation of the Civilization discussion.
1. Genetics and culture are inseparable,
2. Only British genetics can grasp and enact Western Civilization,
3. The U.S. cannot allow a drop below a certain level of British derived population.
I understand that civilization requires trade-offs in education, economics, religion, and other systems. It just seems that the Civilization you describe was doomed the very moment it started. I believe the Constitution allows the nation to be hardier than this hot house flower being described.
2. is false. The U.S. Constitution is not synonymous with Western civilization. Western civilization is hardier than the U.S. Constitution, which was not only written by and for Englishmen, but is only understood correctly by them and those who have sufficiently adopted their culture.
More than that, it was only written for them and their descendants and was never intended to apply to anyone else except some of the German colonists who successfully grasped, accepted, and supported their unusual limited government philosophy.
The descendants of the countries who came later, the Irish, the Italians, the later Germans, the Scandinavians, the Jews, and the Hispanics are not the posterity of the Founding Fathers. It should be no surprise that they have not successfully defended a philosophy they have never accepted or understood nor respectfully abided by a document that was never written for them.
And my rebuttal to those who would argue is very simple and straightforward. Look around you. Do you see anything that is even remotely respectful of the concepts put forth in the U.S. Constitution?