Ashley W. answered 11/15/14
Tutor
5
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History Graduate
It is important because it lead to the Japanese occupation of China during World War II. Japan needed a reason to invade/occupy China, but they did not want to out right invade China. That would make Japan look bad and aggressive to the rest of the world, leading to the world trying to stop Japan as they were trying to stop Germany/Hitler. So Japan created an incident, by bombing some bridges in Manchuria, making it appear as if the Manchurians had blown the bridge up themselves, so that the Japanese could invade saying that Manchuria was acting aggressively.
It would be like if there was a person you really disliked and wanted to punch, but you couldn't just walk right up and punch them. That would make you look bad. So you have to set that person up, make them do something that would give you the "right" to punch them.