Britain defeated the German air force all on their own in 1940 during the Battle of Britain, resulting in Hitler cancelling the invasion of Britain and instead invading Russia in 1941.
Russia inflicted massive defeats on German armies all on their own on the Eastern front.
Did help from the US and Britain help Russia, yes, was it decisive, no.
People need to overcome this 'America saves the world every time' disease. America outright crushed Japan once we got going. And we certainly contributed in a major way to defeating Germany in Europe, but Britain and Russia were key players as well.
You offer versions that are debated to this very day. Just as tactic and strategies of all wars are debated. So many "what if's" to consider. What if the allies hadn't slowed down the V rocket developments and the invasion hadn't neutralized the launch sites? What if the Russian's had not had the 80,000 jeeps and 150,000 deuce and a half trucks to use in maneuvering their forces? How much time did US aid and the bombing campaign lessen the time frame and how far away was Germany away from putting their super weapons to game changing use? Would they have developed an atom bomb?
The British raid on the heavy water factory at Telemark ended the German pursuit of the atom bomb, with the help of Hitler who had no idea it was THE weapon that would have changed the war.
The V2 rocket was like the scud, it was a terror weapon but could not win a war on its own by any long shot.
And Lend-Lease
certainly helped the Russians and the British but each of those nations fought and won key decisive battles on their own with their own equipment. The Russians used their own artillery, own tanks, and millions of men to defeat the Germans on their own terms.
All the food and trucks we supplied were absolutely enormous assets that we supplied. But the battles themselves, the Russians won those all on their own with their own equipment. And the Battle of Britain was the battle that broke Germany's veil of 'invincibility'. Similar to the Battle of the Coral Sea and on the ground at Guadalcanal when the US showed it could stand toe to toe with the Japanese.
Put it this way, if the nutzies hadn't been so racist, so hell fire bent on exterminating jews, the same jews that help fight WWI. Had they not tried to fight to huge wars on two fronts, these nuts could very well had won the war. The japs were a formidable force, as were the Germans....The World won this war against evil and sadly the US who took a lead, has never been able to step away from any wars since then, and it is costing us, this country our families huge....because this war with Islam is a done deal, and we're gonna lose this one big time and I pray God somebody gets wise to the facts.
If Germany had defeated Britain before taking on Russia they would have had a better chance but still would have lost though the war would have lasted a year longer likely, the Russians once they got going were a lot like America, they produced huge amounts of artillery and armor and they had limitless supplies of men.
The Japanese had no chance of winning and the head of their navy Yamamoto said so before they attacked America. He told the Japanese government he could guarantee Japan could wreak havoc in the Pacific for six months but after that he could make no guarantee of anything. He was almost exactly right. The battle of Midway happened on June 4 1942, almost six months to the day after Pearl Harbor and the Japanese lost 4 of their large aircraft carriers which they were hard pressed to replace, pretty much swinging control of the Pacific over to the Americans in ten minutes of battle. From that point on for the rest of the war the Japanese were fighting a delaying action only. The outcome was inevitable. The US started the war with 4 large carriers and ended the war 3.5 years later with 25 large carriers and 75 small carriers. Japan could not even begin to match our industrial output, this is what Yamamoto knew before the war started. Japan's soldiers never gave up in battle, 99% of them across the Pacific fought to the death. It didn't matter, the US was in fact a giant that simply took a couple years to stand up and when we did all was swept before us.
The current war with the radicals in the middle east is no real threat to America or Europe other than they can kill people here and in Europe, which of course is not desirable but we are talking about winning or losing wars and sovereignty. We can never lose.
Germany had 45 million people, a 6 million man army of fanatics with the best military equipment in the world and they lost.
The radicals in the middle east are a pimple. A painful pimple but in the grand scheme of things just a pimple. They can't defeat us ever.
You people that are scared of this nonsense need to get over it. They can't win. They are more like the Timothy McVeighs of the world, they can cause local deaths and damage but that is all. They cannot defeat any of the nations in Nato. Not even close.