The liberals of the 30’s were 100% against the war until Hitler attacked the Soviet Union. So, as long as events were the same and Russia was a communist nation, yes we’d have entered the war on the side of England. Having said that, I don’t think today’s worker is up to the same types of feats. I think the number of freeloaders who have never had a job and will never have one due to handouts would also represent a huge sea-anchor on the economy. Today’s Hollywood stars, though communists (liberal, whatever) would not get behind the effort as they did in the 1940’s. The nationalism of the 40’s is scoffed at today. We’d probably enter the war, but we would not be able to keep it up for long, especially if there was an uncensored press at the front who would put blood on the tube at dinnertime 365 days a year. We’d enter, but quit early at the first opportunity. The war would continue on and off for the next 50 years.
Some of Hollywood’s actors (James Stewart) put a lot of helping hands into the effort. Hollywood was for us winning that one.