Answer:
One of the main arguments used to support US military involvement in Vietnam was the fear that if Vietnam fell to communism, other nations in Southeast Asia could as well.
The correct answer is - C. horses.
The French knew very well what the Native Americans would be interested in, and what can play in their favor, so in order to maximize their own profit, they were selling horses to the Native Americans. The Native Americans were fascinated by the horse, and how much things it was making easier to do, sot hey were not thinking twice to buy one or more. Now apart from making profit from the sale of horses, the French fur traders benefited from the sale of the horses because the Native Americans became much more efficient in hunting with them, thus they were providing much more fur by using the horses.
There are several ways in which a reader can determine the theme of a piece of literature, but the best way is to pay close attention to the very opening lines, where the theme is usually set up.
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George Washington is the answer