"as in" shows an example of what was just described. What existed in 17th- and 18th-century NA was an example of humans existing in different stages of development.
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Grammar GeekBut I don't see it as an ellipsis. In the baseball example, you're saying they like doing this here, just as they like doing that there. She plays the piano, as does her sister. They have a lot of humidity in Texas, as (they do) in Florida.
In your original example, 17th- and 18th-century NA is an example of the first statement.
Grammar Geekhave a lot of humidity in Texas, as (they do) in Florida.This one - the "they do have a lot of humity" is ellipted.
TakaWherever records exist of humans in different stages of development, as in seventeenth-and eighteenth-century North America, it is generally found that hunter tribes neither made nor traded for salt but agricultural tribes did.Wherever records exist of humans in different stages of development, [in the same way that / which], (for exam