Explain the factors that contributed to the dropping of grain prices on the Great Plains between the 1870's and the 1890's. This is US History.

There was a series of huge droughts that ruined much of the produce and of the grains. They had to sell what little they had in order to survive and make up for losses but they were getting killed by imported goods or by grains from other places of the US that weren't hit so severely. This is why the grain prices started dropping which caused many hardships.