The main exchange France brought from the New World was Fur
This is further explained below.
Generally, Mammalian skin is covered by a dense layer of hair called fur. It has a thick layer of underfur and an oily guard hair on top.
The underfur insulates and keeps the animal warm, while the guard hair prevents moisture from penetrating the skin.
In conclusion, The primary commodity that France brought back to Europe from the New World was fur.
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