World war ii, the second phase of the thirty-years war, evolved in the 1930s and culminated in 1945 with perhaps 45 to 55 million people dead around the world, depending on how you count. compare and contrast how the u. s. entered with this war and world war i. what were the similarities and what were the differences? then look at american policy and strategy for fighting the war in conjunction with its allies. how were problems within the alliance resolved in such a way that the allies finally won? what were the chief campaigns that finally brought victory? and how did the war alter life on the home front?