Fertile land and things of that nature
In my opinion the arms race and the existence of theatomic/hydrogen bomb forced the Soviet Union and the United States to fight
"proxy wars" (influencing others to fight, but not directly fighting themselves) because they feared the retaliation of the proxy wars
Answer:
B. Atomic Weapons
Explanation:
Tanks were used near the end of WW1, with tanks such as the Renault FT, Mark 5, and the German A7Vs. Atomic weapons weren't even a concept back then. Gas was used since 1915, invented by a German scientist trying to develop a pesticide, and Machine guns such as the Vickers or MG08 were common in the trenches.
It's not Portland or boise, so C Los Angeles!