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Which didn't happen in 1971. That happened in the whole time period. At least 2 decades. At least.
The difference between "it happened in 1971" vs "it's a continuous trend over several decades" isn't a small difference. That's the difference between an orchestrated event and an organic trend.
Okay, which chart shows that? Why did he link to an article that pinpoints the median diverging in the early 70s?
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