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The most populous nation on the planet has a misbalance of men:women. That’s all it really takes.

This article seems to focus on the United States, where there really isn't an imbalance.

Except that 20s-30s men are competing directly against other, college aged men. And maybe that’s enough.

Edit-another pet theory is a changing climate. Cultures in drier climates tend to be more sexually conservative. A large portion of the US has been in drought conditions for decades

Colleges in the United States tend to have a female majority at the undergraduate level.

You seem to be misunderstanding this thread. The OP was referring to sex imbalance as a matter of chromosomal sex, as in more men than women in countries like India / China.

Granted, as has been pointed out by the parent comment to yours, this study is referring to the US specifically, where there are more women than men in 40 states (https://www.statista.com/statistics/301946/us-population-mal...)

This study is limited to the United States.

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