From what I'm seeing in this timeline, it looks like the socialists are going to win everywhere in the world, I don't think this is very realistic and it will make the years after the Second Great War not particuarly interesting. I think we're going to see the Qing Empire or Shang win in China and they won't like the Syndicalists at all. I find it hard to believe that the Union of Britain would be able to force Canada and Australasia to surrender without the use of atomic weapons, so they'll probably remain right-wing dictatorships or
On the USA, I think the federal government is the only faction in the Civil War that can win. The problem with the AUS and CSA, is that they're aiming at a particular group of people in a particular part of the country. For blacks and many poor workers, the AUS is going to be seen as the anti-Christ, while farmers in the Midwest are going to see the CSA in a similar light and if they go on strike then the CSA would be doomed. As for the PSA, it doesn't want to win the civil war, it wants to escape from the destruction.
Another point I wish to make is this, in civil wars, the advantage is usually with the incumbent government, unless the government in question is very, very corrupt (see OTL Nationalist China or KR Spain/Russia) or the army chooses to side with the rebels (see OTL Spain). Neither of these things would be true with the USA, the US army would be much better organized than anything the rebels could bring up, with the exception of the PSA. I'm not saying a Second American Civil War would be easy, it would probably last until at least 1939, but I think the chances of Reed winning even with foreign supplies would small.