The Ganga-Brahmaputra river basin region experiences a monsoon type of climate.
The climate of ganga brahmaputra basin is hot in summre and cold in winter because it lies in sub-tropical reason of northern hemisphere.
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Answer:
The reason why more African Americans settled in Mississippi Alluvial Plain is that this region is ideal for agricultural purposes.
The rivers coming from the mountains bring sediments and have built deep layers of soil here making it ideal for landforming. Ozark Mountains region, on the other hand, lack plain land as there are more forests and lakes.
Apart from that, Africans were brought in Mississippi Alluvial plain as slaves and they worked on this land for a long time. That's is why they are more concentrated in this region.