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IQ 90 is the MINIMUM estimated national average IQ required to maintain a US style constitution, in other scholars essay on this topic, and why Africa , all of africa, turns socialist, and cannot maintain a proper civilization or US style constitution. Take look at bottom of this list of IQ from composited science paper research , it lists countries too stupid to maintain a Democracy: https://iq-research.info/en/average-iq-by-country Sri Lanka - 79 IQ !!! Zambia - 79 Democratic Republic of the Congo - 78 Nepal - 78 Qatar - 78 Comoros - 77 South Africa - 77 Cape Verde - 76 Congo - 76 Mauritania - 76 Senegal - 76 Mali - 74 Namibia - 74 Ghana - 73 Tanzania - 72 Central African Republic - 71 Jamaica - 71 Saint Vincent and the Grenadines - 71 Sudan - 71 Antigua and Barbuda - 70 Benin - 70 Botswana - 70 Rwanda - 70 Togo - 70 Burundi - 69 Cote d'Ivoire - 69 Ethiopia - 69 Malawi - 69 Niger - 69 Angola - 68 Burkina Faso - 68 Chad - 68 Djibouti - 68 Somalia - 68 Swaziland - 68 Dominica - 67 Guinea - 67 Guinea-Bissau - 67 Haiti - 67 Lesotho - 67 Liberia - 67 Saint Kitts and Nevis - 67 Sao Tome and Principe - 67 The Gambia - 66 Cameroon - 64 Gabon - 64 Mozambique - 64 Saint Lucia - 62 Equatorial Guinea - 59 IQ !!! The smartest countries all have the least brown or black skins. I don't have a lot of time to discuss your statements, other than to let you know that US national IQ INCREASED from various effects related to proper nutrition, and later mandated vitamins in foods, and iodine (critical for IQ), to counteract your possibly correct theory as to past peak IQ. The collapse will occur faster as Whites are replaced and die or leave job market from aging. On the other hand the reason it is thought a national IQ average of 90 is still able to function, is because society does not REQUIRE a lot of people above the IQ of 124, for maintaining society, but is obviously benefited by them. A bigger problem is crime, kleptocracy, and other corruptions. GDP is DRAMATICALLY altered by a SINGLE DIGIT of IQ!!!!