I'd say that it would be gold rush
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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Democracy and freedom from post World War II Communist Russia.
George Washington was the first president.
