In which of the following ways was Cyrus McCormick's grain reaper significant?

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Cyrus McCormick's grain reaper helped bring mechanical power to the Midwest, Old Northwest, and Great Plains. It allowed farmers to harvest crops more efficiently and quickly, which led to increased agricultural production and economic growth in these regions. The grain reaper was initially horse-drawn, but later versions were powered by gasoline engines. It did not require farmers to rely more on muscle power, nor did it need to be assembled by farmers.

In Which of the Following Ways Was Cyrus McCormick's Grain