<span>It showed the world that the US was ready to expand its empire and gain resources in other parts of the world. It also let the world see how strong the US's army and navy really were, as this was the first time in quite a while that they fought anybody outside of America.
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The answer is D. <span> invention of the first steel tools
Actually, this very topic is still a hot debate among scientists because the shift happens on different reasons in each region of the world.
But one thing they have in common is that Steel tools give the member of early societies the capabilities to rake uplands and cutting up crops that really useful in farming and herding.</span>
If we are talking about the second world war, then then answer would be that the Chinese kept the Japanese busy fighting them, and in turn, about 800,000 of their troops. This gave the Americans, who were the main force against the Japanese during this time, a little breathing room with which to continue military operations.
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