What tradition did the Olmec beginthat were later adopted by other civilizations

Traditions that the Olmec began that other civilizations later on adapted too was that Olmec traders swapped finely made Olmec celts, masks and other small pieces of art with other cultures such as the Mokaya and Tlatilco, getting jadeite, serpentine, obsidian, salt, cacao, pretty feathers and more in return.

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