It helped them get to places a lot faster
He used the atomic bomb against Japan because they were one of the world's major powers. They quickly industrialized and imperalized countries bigger than their own but USA didn't have that kind of firepower but we had bombs to drop with huge explosive power and Japan wasn't ready for that. Think to yourself and say what if Japan imperalized my country were or who would I be now
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Up until 1895, the U.S. didn't get involved when European governments would create puppet governments, so as to avoid obvious colonization.
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Byzantium was created to preserve the civilization and values of both the Greeks, and Romans.
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I would say option 2 because people could have different opinions on weather it was effective or not, which would allow you to make it into an argumentative essay.