>There are many jeans produced in the US. Some are good, others aren’t.

So, what are some good "made in USA" jeans -- and what are some bad ones? Generalizations aren't helpful.

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>There are many makers in China that produce some of the best constructed denim in the world.

Source? Or even a manufacturer name so we know what to look for? Or are you just generalizing again?

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>So this comment isn’t very helpful.

You are correct. Try harder next time.