Completar frases parrafo a completarVersión en línea para completar por Carmela Donis 1 service state major more involved placed widespread industrial between capabilities people erasing eventually known opposing lasted World War II ( WWII or WW2 ) , also as the Second World War , was a global war that from 1939 to 1945 . It the vast majority of the world's nations including all of the great powers ? forming two military alliances : the Allies and the Axis . It was the most war in history , with than 100 million serving in military units from over 30 different countries . In a of " total war " , the participants their entire economic , , and scientific at the of the war effort , the distinction civilian and military resources .
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