This would have given Hitler an advantage in Africa, and he could have conceivably taken over much more territory and been much harder to control and subdue. In addition, on the Pacific front, the Japanese were attempting to take over as much territory as they could find, all the way to Australia and beyond, and the Americans defeated them many times during 1942, including at the Battles of Coral Sea and Midway, where countless Japanese soldiers died, and numerous Japanese ships were sunk. If America had not entered the war, Japan could have gotten a much bigger foothold in the Pacific, and might have been impossible, or much harder to stop. In Europe, there might have been far more dire consequences if America had not entered the war until 1942. England was weakening, and it is very conceivable that the country could have fallen to the Nazis in 1942. This would not only give Hitler much more bargaining power with the Allies, it could have spelled disaster for all of Europe. The Nazis would have controlled most all of western Europe, and they would be extremely difficult to dislodge once they were established. Losing England would mean losing an important ally, but it could have also meant catastrophic loss of life for Great Britain. It also would essentially end a culture that has been in existence for hundreds of years. Thus, if the U.S. had waited a year to enter the war, the...

It is not a given that Hitler would have won the war, however.
The Americans were well on their way to developing the atomic bomb in 1941, which means that even if the country had waited a year to enter the war, they would have still had the technology to use the atom bomb in Europe, as well as in Japan, and it is nearly certain they would have used it, if necessary. Dislodging Hitler from Great Britain would be a difficult task, and almost surely, President Truman would have used the atom bomb, just as he used it to end the war with Japan. He justified its' use by noting how long the war would have dragged on and how many more lives would be lost without it. Surely, the same rationale applies to Europe. If the Germans had taken Great Britain, probably the only way to dislodge them would have been with nuclear warfare. This means countless innocent citizens would have died before the Allies could claim victory. Thus, the war could have dragged on even longer, with more catastrophic loss of live and property if the U.S. had not entered the war when it did, and waited another year to do so. America did not win the war single-handedly, but our involvement helped turn the tide of the war and bring it to a successful conclusion. If we had entered earlier, it might not have been as bad, and if we had entered later, it might have been much…