The correct answer to this question is the letter D. Frontier Attitude.
Frontier Attitude is a desire to take control and utilize nature in the most profitable manner. Perhaps it is still around today; in the farm and mine land. It’s measured by its quantity rather than its quality.
D. To protect soldiers from machine gun fire
People dug trenches to keep "causalties down"
hope this helps
Answer:
The answer is C.
the decline of tensions between the U.S. and the Soviet Union
Explanation:
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