We came within a whit of losing WW2 on several occasions. First, we had essentially done away with our military during the 1930s and, when WW2 broke out, our military was incapable of defending us. Fortunately, at that time, we still had two virtually impassible oceans to protect us. We also were primarily an agrarian society and our young men across the nation had were marksmen who had grown up using firearms for hunting and other shooting sports and needed very little training in order to understand and master military application of firearms.
Once the war was underway, our hard fought victories at Midway was one among a number of situations that might have led to our defeat had they ended differently. For example, Germany nearly had the atomic bomb before us but they chose a technology that used heavy water. We destroyed their heavy water factories on at least two occasions (it may have been three but I can't remember right now). Had they actually produced atomic bombs first, they would have bombed London, New York, and Washington and we would have surrendered first.
Had Hitler refrained from invading the Soviet Union, Stalin would have not gone to war against Germany and the German armies that were wasted in Russia would have been dedicated to their eastern front with disastrous consequences for America and our allies. We may very well have been pushed off the European continent and subsequently lost the invasion battle of England. Ultimately, Germany would have reinforced Japan in the Pacific and mounted a strong invasion of America on both coasts and, perhaps, with the help of Mexico who could have easily been persuaded to join them in such a conquest. Remember that Mexico was friendly with Nazi Germany and refused to fight as our ally in WW2.
Hawker is right. It is very difficult to explain our victory in WW2 without divine intervention. There were simply too many opportunities to lose that we somehow overcame without crediting God's help. Perhaps our "Greatest Generation's" greatest weapon was their unwavering belief in God. In those days, America was a Christian nation with an unblinking belief in and worship of God. We are not that America today, to our detriment.