How did societies in the Northeast, Mississippi River Valley and Atlantic seaboard develop mixed agricultural and hunter-gatherer economies that favored the development of permanent villages?

Fertile lands where they migrated.

Explanation:

The societies in the Northeast, Mississippi River Valley and Atlantic seaboard develop mixed agricultural and hunter-gatherer economies due to the location which they migrated that favored the development of permanent villages. The agricultural farming taken the place of hunting the animals when the societies start living on the fertile lands present along the rivers. In these places, crops produces food in large amount which is enough for the population so they settled on these lands that leads to making of permanent villages.

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