The proportion of smart people in the population shrinks, life deteriorates, and a gaggle of mediocre government functionaries presides over it all. From the Zman at theburningplatform.com:
When trying to understand what has gone so terribly wrong with the Occident, observers often point to intelligence as the main driver. The populations of the West are getting dumber, so they are less capable than in the past. This is not to say there are no geniuses today or that there are fewer of them. It’s that their proportion of society is smaller than in the past. It is the smart fraction that is getting smaller. As a result, the progress of the West has slowed and may be in reverse.
The typical way this is explained is this way. Imagine a man dragging a sack of rocks down a road. If he is a large man and the sack has only a few rocks, he can drag the sack as fast as he could walk without it. If on the other hand, he is a small man and the sack has many rocks, he will move much smaller than his capacity. This will show up most prominently when his path is not clear. He may even come to a halt when he comes to a hill or a long incline.
Now, one reason for this decline in intelligence, is the mass invasion from outside the Occident over the last fifty years. Minneapolis is now a dysfunctional city because of the importation of sub-Saharan Africans. The sorts of people who think Ilhan Omar is a great leader will struggle with modernity. The reason these people are trapped in the Neolithic age is they lack the cognitive ability to go much further. California looks like Mexico because it is now full of Mexicans.