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Manchuria
Japan was seeking a way to grow their industerial which led to the to the invasion on the chines in Manchuria in 1931. which led to japan controlling this big part of china. in 1939 the armies of japan and the soviet union clashed in Manchuria. The battle of the soviet union and japan lasted for four months and the outcome was a defeat for japan.
https://www.trumanlibrary.org/dbq/manchuria.php
