The Revolutions of 1848 were some of the biggest disasters at democratic societies in the 19th Century. Their lasting effects would continue to haunt Europe, as well as the rest of the world, well beyond the last half of the 20th Century, and still leave scars today.
Point of Divergence:
But, what if it hadn't?
What if, Otto von Bismarck hadn't been born in strict Junker family, but an upper-middle class family, which devoted itself to Prussia and God, all the while trying to help the plight of the average German?
What if, Franz Joseph I's attempt to pacify Hungary had been a complete disaster, and the Hungarians had been able to rally the larger regions of Galacia, Transylvania, and Croatia to their side, overwhelming and disbanding the Austrian Empire?
What if, due to their weakness, Piedmont-Sardinia had united Northern Italy early, without threat of Austrian retaliation, creating the Kingdom of Italy three decades earlier?
What if, Russia, Spain, France, Britain, Sweden-Norway, and the Ottomans had been so bogged down in revolutionary ferver, that they couldn't do anything to stop it?
What if, the Mexicans had managed to hold off the Americans long enough, to where popular support for the war plummeted, with the US only annexing Texas (including the rest of the land it claimed), and leaving the Mexicans as a major power in North America?
Well, you're going to find out...
Pre-1848: These are the main countries right after the Congress of Vienna.
Post-1848: These are the main countries after the Revolutions come to a close.