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In the United States, the average age of menarche has _____ since the mid-nineteenth century

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In the United States, the average age of menarche has declined significantly since the mid-nineteenth century

What is Menarche?

Menarche  can be explained as the  first menstrual cycle or the  first menstrual bleeding that is been experienced by female humans.

Looking at this from social and medical perspectives, it serves as the  central event of female puberty,  and can be attributed to fertility however, In the United States, the average age of menarche has declined significantly since the mid-nineteenth century

Learn more about Menarche on:

https://brainly.com/question/20723656

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