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on september 1, 1939, nazi germany concentrated its powerful forces and launched a "blitzkrieg" against poland. the polish army was defeated and retreated step by step, and a large area of ​​the country fell. world war ii broke out! as early as eight years ago, after the september 18th incident in 1931, china's war of resistance against japan had already begun.

after the july 7 incident in 1937, china and japan went to war. so the question is, why was the beginning of world war ii marked by the german blitzkrieg against poland, rather than the september 18 incident or the july 7 incident? first of all, it should be made clear that there are clear criteria for the signs of a world war, that is, most of the powerful countries must have participated in the war, and the battlefield must not be limited to a single continent.

moreover, when a war breaks out, it is easy to cause global conflict. obviously, the september 18th incident did not have such an impact. because at that time, it was only a war between china and japan, and other powerful countries such as britain, france, the united states, germany, and italy did not intervene. the soviet union only fought the battle of nomonhan with japan in outer mongolia, china on may 11, 1939.

on april 13, 1941, the soviet union and japan signed the soviet-japanese neutrality treaty. moreover, after the september 18th incident, there was no substantive full-scale war between china and japan. it was not until july 7, 1937, when japan provoked the marco polo bridge incident and launched a full-scale war of aggression against china, that a full-scale war broke out between the two countries. but after that, it was still only a war between china and japan.