A House United: What if the Union Won the War of Southern Independence?

Any details?
Wilhelm II isn't as emotional so he forms an alliance with the UK and Russia. Eventually the Russian Empire collapsed into civil war and Nicholas II is assassinated and Wilhelm proposes that he be crowned Tsar of Russia to form a Russo-German personal union, which the Duma accepts. Eventually Russia and Germany are so politically, economically, and socially close that their governments decide that their better off united and form the Russo-German Empire in 1937. The nation remains a dual monarchy like Austria-Hungary for a few years, however, with the death of Emperor Wilhelm I (OTL Wilhelm II) and the coronation of his son the Empire is reformed into a federal constitutional monarchy. Today it is the global superpower trying to compete with what remains of the Synditern, especially the Confederated Socialist Republics of America (the CSA's ultra-bureaucratic successor).
 
Wtf is going on in South America.
The Brazilian monarchy continues and after the alternate WWI (called the First Weltkrieg) is overthrown by syndicalists who start the Union of Latin American Syndicates, which goes on to lead the Syndintern, conquer much of Latin America, and butt heads with Russia-Germany in the Cold War. the ULAS collapses in the early 2000s and is currently in a civil war between an alliance of democratic groups and the rump ULAS. Many consider this to be the start of the Second Cold War, between Russia-Germany and the Confederates.
 
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