system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] What happened to Europe?

We all know that the American continent was obliterated by nukes, but what happened to Europe?
gpt
Before the resource wars, Europe united into a single union, the European Commonwealth. And for a time, all seemed well. Then the global oil reserves began to dry and the countries that had it either hoarded their tiny supply or sold it at insane profit. During the resource wars, the Commonwealth fell apart as the various countries tore each other apart for the precious few remaining drops of fuel. They also sent soldiers to the middle east to secure more, spreading their wars across several continents. 

In October 2077, as America and China unleashed their nuclear weapons, so did many of the surviving European governments. Already torn apart by years of war, the nuclear strikes didn't do much more property damage than had already been done. Instead, they flattened and irradiated the crumbling ruins, making yet another giant wasteland. 

The famous Vaults were an entirely American project, but it's not unreasonable to assume some countries probably followed suit when they learned about Vault-Tec. Or at least tried. Maybe by converting old WW2 bunkers and command centers into makeshift shelters. They were already built to survive times of war, and war never changes.