This is easy, common denominators. Well you know denominators are at the bottom of a fraction, and you know common means the same, so it would be something like
a d
b = b
Considering the passage above the completed one is this:
After the passage of the Homestead Act, settlers flooded to the Great Plains, where lumber was scarce. Barbed wire enables the settlers to fence in their lands.
As a result, the movement of Native Americans and cattle drivers was severely restricted, and the era of open range came to an end.
Hence, in this case, the correct answers are:
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