They didn't, they used gas which was against international law.
Answer:
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Explanation:
The answer is D. expensive wars with neighboring tribes.
The right term that is used usually to describe a region just beyond or at the edge of a settled area is a <u>Frontier</u>, because in that context, a frontier is a place or imaginary line that limits a region, territory, location, city or a country extension, and where sometimes the frontiers are located further or at the border of a settled area.
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