My extensive reading of WW2 leads me to believe that a stalemate or negotiated truce might have occurred We may have supplied huge amounts of equipment to the USSR, but heir overwhelming supply of man power was paramount.
Hitler's big mistake was heading east. I pissed off the Japanese, who had signed a truce with the USSR so they could go into China with impunity, so they retaliated by attacking Pearl Harbor without telling the Germans first, bringing the U.S. into the war. Both the Reich and the Empire lived long enough to regret the respective decisions. In response, Hitler declared war on the U.S. before we declared war on him, thus bringing the U.S. into North Africa. We were the ONLY country that Hitler declared war on prior to attacking. Actually, he couldn't really attack us since he had no offensive weapons that would reach the North American continent. He could harass our shipping to pressure Great Britain, but he was unable to attack the U.S. directly.
Near the end, just how bad was it? Japan 1945 rice harvest worst since 1909. Hunger & malnutrition became widespread. After mid-1944 lack of raw materials forced war production into steep decline. Civilian economy reached disastrous levels by mid-1945. Aircraft production, entire war, totaled 70,000 planes. Japan produced 25 Aircraft Carriers during the entire war. United States Industrial production overwhelmingly superior to Japan's. By 1943, U.S. produced 100,000 aircraft a year. By mid-1944, U.S. had deployed 100 Aircraft Carriers to the Pacific. Invasion plans predicted 1.7 to 4 million Allied casualties, with 400,000 to 800,000 dead. U.S. predictions for Japan were 5 to 10 million dead. The great unknown being prepared in New Mexico did not stop invasion plans. U.S. Army propaganda poster prepares the public for the invasion of Japan after ending war on Germany and Italy (Uncle Sam wielded a big wrench!) Delivering Finality: Aircraft of the 509th Composite Group that took part in the Hiroshima bombing. Left to right: Big Stink, The Great Artiste, Enola Gay
The war in Europe ended on VE Day, May 8, 1945, when the Red Army entered Berlin and caused the Nazi Army (Wehrmacht) to surrender. The US Army also arrived, but the Russians got there first after a crushing bombardment of the City. I was almost 9 years old at the time. Hal
Hitler's Luftwaffe was developing a bomber that could reach America's east coast, bombard NewYork City, and return to occupied France without refueling. It was called the "New York Bomber", but was never used, as VE Day came first. Hal
As far as I know, Germany (and Japan) never even developed a 4-engine bomber that could reach the north of the UK from Germany. They had to have Norway to reach northern Britain. That is a long way from crossing the Atlantic and back.