A Cause of WWII

I believe that World War II started partially due to the division of territory on September 16th 1939 but there were also many other steps that lead up to World War II. On September 16th Russian joined Poland's territory and spilt it up to territories of Germany vs. Britain and France. But this was all located in Poland, so Poland was over loaded with people and the French and British declared war. But then Russia moved in, and no war was declared. It all had to do with the soviet Union because when they entered Poland all hell broke lose, and the Soviet Union started capturing the polish and being shit disturbers. So if all the nations stayed in their own regions a world war II may have never been caused.

http://www.threeworldwars.com/world-war-2/ww2.htm