One factor that led to the establishment of organized communities was simply the size of the migration movements, especially from the South, that required "grids" to be formed in many cities in the North.
Franklin Roosevelt. I think that is the right answer. I could be wrong.
Answer:What is the name of the region situated between the Mississippi River and the Rocky Mountains?
Great Plains
The Great Plains are found between the Mississippi River and the Rocky Mountains.
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I hope this helps
Answer:
Mainly just having to do with where they were and how they were all over america, and slowly getting pushed out west.
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