The Axis was opposed by the Allied Powers
The correct answer is more prosperous and less democratic
Japanese conquests led to a wave of euphoria and enthusiasm in Japan, which, coupled with extensive indoctrination, developed a strong nationalism that defended imperialist ambitions. Throughout the 1920s and 1930s, there was an extreme right-wing authoritarian regime in Japan that fueled nationalist militarism and Japanese imperialism.
This nationalist and imperialist discourse in Japan claimed that the mission in China was unique and exclusively civilizing, but it is known that Japanese interests were motivated by economic issues. During the 1930s, two incidents led to the Japanese invasion of Manchuria (northeastern China) and, finally, the start of the war.
The sentence that provides a clue to the meaning of Slaughtered is
"Entire Populations were slaughtered".
Slaughtered means kill or defeat.
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I had that question its number 2...
answer is 1810