5 ms·The "50%" is the Nazi-Soviet alliance.by srtjstjsj 6y agoThe "50%" is the Nazi-Soviet alliance.ant6n 6y agoThat didn't cause WW2. In fact the nazis broke the Hitler-Stalin Pakt as part of WW2.rasz 6y agoGermany broke that pack two years into the war, two years into Russia killing and pillaging on Hitlers side.