The answer is D hope this helps.
I’m not positive but I believe that it’s something to do with oil
I think that the answer would be A. economics was a big factor in those times
There were many problems farmers faced when they went to settle on the Great Plains. One of the problems was the land. The soil was much more difficult to farm in the Great Plains .they had to make new inventions Steel-tipped plows were invented to help farmers turn over the soil. and the climate was very different
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(jacemorris04)