The Memphis Belle was the nickname of a U.S. Army Air Force Boeing B-17F that flew strategic bombing missions from England into continental Europe. As part of the 324th Bomb Squadron of the 91st Bomb Group, the plane flew 25 operational missions between November 1942 and May 1943, returning from all missions with its crew intact.

Most of the plane’s missions were flown by the same crew, but a few were not. Conversely, the plane’s usual crew, headed by Captain Robert K. Morgan, flew several missions in other B-17s. According to the 324th Bomber Squadron mission reports, the plane’s usual crew flew their 25th mission on May 17th, 1943, piloting the Memphis Belle to the Keroman submarine base, located in the Breton city of Lorient. There they bombed a platform used to pull U-boats out of the water. However, the aircraft itself did not complete its 25th mission until its next flight. That flight, manned by a different crew than its usual one, occurred on May 19th and sent the Memphis Belle to the Kilian submarine pen and bunker at Kiel, Germany. Its mission was to bomb an engineering and turbine engine workshop.

So, the 25th mission of the crew occurred two days before the 25th mission of the aircraft, which may account for some of the confusion about the “last mission.” After both crew and plane completed their respective 25th mission, the crew received the Air Medal with three Oak Leaf Clusters and the Distinguished Flying Cross. They were then ordered in June to fly the Memphis Belle back to the United States for a cross-country tour, the aim of which was to increase morale back home and to sell War Bonds.

The commanders who directed the bombing raids on Europe had decided to limit a crew’s tour of duty to 25 missions in order to increase morale among the crews: Casualty rates at the beginning of the missions approached 80% and when the Memphis Belle completed its tour (the first heavy bomber to do so), it was a joyful event, not only for the crew, but also for the entire air command and the American public.

To mark the event, American filmmaker William Wyler (then a Major in the U.S. Army Air Force) filmed and produced a 1944 documentary for the War Department entitled Memphis Belle: A Story of a Flying Fortress. In 1990, Wyler’s daughter Catherine produced a fictionalized movie of the plane’s 25th operational mission, entitled Memphis Belle.

America’s home front effort included recruiting for the military, participating in scrap drives, paying income taxes, buying war bonds, using rationing coupons, planting Victory gardens, encouraging sanitation, volunteering for civil defense work, increasing public morale, and participating in industrial retooling and production. The Hollywood studios that were making cartoons at the beginning of the war were quickly drafted into turning their art to the war effort, to mobilize the American public. Cartoons were just one part of a propaganda effort, which also included the production and distribution of feature films, posters, war-themed commercial radio, newspaper and magazine advertising, the organization of celebrity tours and war bond drives, the establishment of censorship offices, and the formulation and distribution of a barrage of information and directives from various government officials and agencies.

Leon Schlesinger Productions produced popular cartoons featuring Daffy Duck and Bugs Bunny for Warner Brothers Studios, many of which had war themes, such as “The Ducktators” (1942), “Confusions of a Nutzy Spy” (1943), “The Fifth Column Mouse” (1943), “Tokio Jokio” (1943), “Daffy—The Commando” (1943), “Falling Hare” (1943), and “Draftee Daffy” (1945).

At least two of these Warner Brothers’ cartoons focused on home front activities and might be the cartoon you’re thinking of: “Scrap Happy Daffy” (1943), and ”Wacky Blackout” (1942).

Walt Disney also produced many war-themed cartoons with Mickey, Donald, Goofy and the rest of the gang, some of which were focused on the home front, such as “Out of the Frying Pan into The Firing Line” (1942), and ”Food Will Win the War” (1942).

A collection of short cartoons and movies from the Disney Studio during World War II, which includes many intended for the home front, was released (for purchase) in 2004 as a 2-disc DVD, “On the Front Lines,” in the series “Walt Disney Treasures.” This collection includes such titles as “Donald Gets Drafted” (1942), “Private Pluto” (1943), “Home Defense” (1943), “All Together” (1942), “Defense Against Invasion” (1943), and “Cleanliness Brings Health” (1945), as well as many others. The collection also includes Disney’s 1943 animated film, “Victory Through Air Power,” as well as a few of the hundreds of training films that the Disney studio made for the War Department or the National Film Board of Canada, such as “Four Methods of Flush Riveting” (1942).

During the months preceding the attack on Pearl Harbor, the war in Europe had essentially boiled down to a contest between the Axis Powers of Germany and Italy, and against them, the Soviet Union and Great Britain.

Six months before Pearl Harbor, Germany had launched an invasion of the Soviet Union, its erstwhile ally. By December 5, two days before the Japanese attack on Pearl Harbor, German armies had advanced to within 5 miles of Moscow.

Hitler had decided to postpone a cross-channel invasion of Britain itself until his armies were able to defeat the Soviet Union, but Germany was still fighting Britain through aerial and missile bombing, and was engaged against Britain on the seas, as well as elsewhere in the British Empire, as in North Africa. In South Asia, Britain was also defending its colonies and commonwealth against Japan. On the face of it, especially in the long term and even with Lend-Lease aid from the United States, it is difficult to see how Britain could have continued the war without the entry of the United States into the conflict on its side. Presumably, Winston Churchill would have had to sue for peace, or endure a German invasion of the British Isles once the Nazis had consolidated their military strength in Europe.

That did not happen, of course. After Churchill heard that America had been attacked at Pearl Harbor, he rushed to a secure telephone to call Franklin Roosevelt. His Memoirs of the Second World War relate the following:

In two or three minutes Mr. Roosevelt came through. "Mr. President, what's this about Japan? "It's quite true," he replied. "They have attacked us at Pearl Harbor. We are all in the same boat now."

No American will think it wrong of me if I proclaim that to have the United States at our side was to me the greatest joy. I could not foretell the course of events. I do not pretend to have measured accurately the martial might of Japan, but now at this very moment I knew the United States was in the war, up to the neck and in to the death. So we had won after all!

Yes, after Dunkirk; after the fall of France; after the horrible episode of Oran; after the threat of invasion, when, apart from the Air and the Navy, we were an almost unarmed people; after the deadly struggle of the U-boat war—the first Battle of the Atlantic, gained by a hand's-breath; after seventeen months of lonely fighting and nineteen months of my responsibility in dire stress. We had won the war. England would live; Britain would live; the Commonwealth of Nations and the Empire would live.

How long the war would last or in what fashion it would end no man could tell, nor did I at this moment care. Once again in our long Island history we should emerge, however mauled or mutilated, safe and victorious. We should not be wiped out. We should not be wiped out. Our history would not come to an end. We might not even have to die as individuals. Hitler's fate was sealed. Mussolini's fate was sealed. As for the Japanese, they would be ground to powder.

United States forces played a direct role in defeating Germany, but also forced Hitler to keep huge military forces in Western Europe rather than sending them to reinforce his armies fighting against the Soviet Union, where they would likely have been a decisive factor against the Soviets. Instead, the German invasion of Russia failed after the effort that culminated at Stalingrad, and the German forces in Western Europe were eventually pushed back anyway, beginning with the landings at Normandy.

Your questions are hypothetical. They invite speculation. One of the delights of the alternate history genre of fiction is that its authors generally expend some considerable effort on the notion of history itself, especially the way in which history unwinds out of a skein of causes both large and small. In these novels, large and familiar causes and conditions and forces roll out across the world, but small human details, such as a missed appointment at the Reichs Ministry, an overlooked telegram, Hitler's mistress Eva Braun's choice of perfume on a fateful day, or a random batch of sunspots that interferes with a particular radio transmission, sometimes cascade into a vastly different history than the one with which we are familiar.