B) The pope and the patriarch excommunicated each other
It was July 16, 1054 when Patriarch of Constantinople was excommunicated. This started the “Great Schism” that created the Roman Catholic and Eastern Orthodox faiths
Hence the answer
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A conflict in which the participating countries devote all the resources to the war effort.
The United States maintained neutrality up until the point where Japan bombed Pearl Harbor. After that, it was impossible for the US to keep to itself.
