Two World Wars killed off the best of the English stock.
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There is much truth in that. I have heard (very drunk) Russians discuss this with respect to WWII and Stalin’s purges as well. They called the phenomenon of killing their best stock ‘devolution’.
I would add to this that socialism is dehumanizing. It suppresses normal human creativity and ambition, and substitutes a numb servility that is hard to shake. England is rotten with it, and already started with the mindset of ‘subjects’.
In ancient warrior societies, the conquering warriors would return with loot and female slaves, and thus achieve a much higher number of children. Doesn't work that way any more.
It was only when we decided everyone was equal that things started to go downhill.