Tigris and Euphrates is the answer
B. It brought about the unconditional surrender of Japan.
Not A, the bombs were dropped instead of invading, which had a very high estimated casualty rate if the US did.
Not C, Germany eventually faltered and caved in, and then surrendered in the European Theater.
Not D, the Japanese Empire was using Kamikaze attacks longs before Atomic weapons were developed.
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None of the countries cited was fully created after the First World War. What happened was the restoration of Poland (c) after this period. Before 1918 the country was submerged under German, Russian and Austro-Hungarian rule. In 1939 he would again be under foreign rule.
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The first blank: Quipu
Second: Metalworkers
I’m not sure about the rest but hopefully, this has helped with your assignment