Which ethnic group brought the rice and beans?

Akan tribe

Explanation:

Rice and peas was adopted from the Akan tribe hailing from Ghana and Ivory Coast in West Africa. The dish, which still exists in those countries today, is known as Waakye and of course consists of the usual rice and beans.

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CAN I HAVE BRAIN

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.