Would the Allies have won WWII without America getting involved?

They couldn't have defeated Japan without us. Probably could have slowly worn out Hitler and the Italians though.

Britain would have held it's own. Germany didn't have the navy to mount a land invasion of Britain.

The answer is easily no..

The European Theater would have ended in a stalemate, had Germany not declared war on the United States. The Eastern Front would have settled into a WWI-Esque battle. Germany would never have been able to invade Britain, unless they were left to build up another war machine in post war peace time. Hitler sealed his fate by launching Barbarosa and declaring war on the US, if he had only done one or the other I believe part of Europe would still be under Nazi rule. This is my opinion

I doubt Germany would have ever successfully invaded Britain regardless, they simply didn't have the necessary naval strength.

However, had America not joined the fight AND Hitler had the foresight to not invade Russia and piss off Stalin, Germany would probably have retained control of most of mainland Europe and northern Africa. Once he invaded Russia his fate was sealed, and ultimately I think even without us England and Russia would have worn them down. It would have taken MUCH longer however.

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When I was a kid, I was under the impression we won the war alone

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This is not correct.

Before the U.S. jumped in, the Soviets were already marching westward against Germany. Even after the U.S. joined in, the Soviets still got to Berlin first. The main thing American involvement did was keep the Soviets from taking over Western Europe in the process.

As for the Pacific front, Japan was getting bogged down in China much like Germany was bogged down in the USSR. In fact, the Japanese attack on Pearl Harbor was an act of desperation to buy time, due to them running low on oil supplies. Eventually, China would have driven Japan out and taken over the rest of Japanese-occupied Asia. The main American accomplishment in this theater was keeping the Chinese from taking over all of that land after kicking the Japan out.

For what it's worth, since the European theater fighting ended first, the Soviets then got involved in this theater too and began taking over northern China from the Japanese. Ultimately, U.S. involvement here also limited Soviet expansion.

Amc doesn't play documentaries like that. Are you talking about the longest day? Great movie no doubt. No way the allies would win without the u.s. Britian wasn't stupid. Look at their casualty rate compared from World War I to II

Nobody could have handled Japan in the Pacific.

However, Russia pretty much handled the Germans from Stalingrad on - that was years before we opened up Italy and France.

Perhaps they would have run out of steam and settled on splitting Poland (more favorably Stalin's way) by 1946 or 1947.

Of course, we did logistically support the Russians - so if you remove America completely from the equation either lend/lease, or the other things we did pre-Pearl Harbor, and the more robust logistical things we did from December 1941 until we got our feet underneath us in early 1943 - maybe it goes the Germans way - it is difficult to say because of the massive scope and complexity of the war.

To put it in perspective, when you lay the war's pure volume next to all other wars fought before and since, combined, it dwarfs them. It is, by far, the most significant 6 years of conflict in all of human history. We are still feeling its effects some 70 years later.

You have to wonder if the Germans could have held off the russians if the US wasn't putting troops not he ground in the west.

I think they would at least have and a stalemate with Russia.