Why did Plains farming tribes normally settle in regions along rivers in eastern Oklahoma? A. These regions received more precipitation.
B. These regions had a larger buffalo population,
C. These regions had a more established trade route.
D. These regions had fertile floodplains.

D.) These regions had fertile floodplains.

Explanation:

because the vietnam war was fought in an especially brutal and untraditional way

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.