WW2 was a total war .More than 60 countries and areas entered the war and 2 billions populations (80 perent of the world populations) were involved in it.War sites covered 4 continents----the Europe,Africa,Asia and Austrialia.The war spending was 3000 billions US dollars and that was 60 or 70 percent of the income of the war countries.90 millions pepole died or hurt in the war.28 millions Soviet Union pepole and 18 millions Chinese people lost their lives,including soldiers and civilians.