How did the geography of mesoamerica encourage trade

The Mesoamerican region provided jade as well as obsidian and it's proximity to the ocean provided it seashells and sharkteeth, prized for it's use in jewelry. Furthermore, it's land was farmable and suitable for slash-and-burn agriculture where maize was grown. However, all these items were found in different areas of Mesoamerica. Thus, the people who inhabited these areas traded with other groups to get what they wanted and/or needed.

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what are two things that greatly the american economy after the war? the huge buildup of u.s. military the beginning of the korean conflict the creation of the gi bill the marshall plan for nations

i see, would you mind putting it as one?