Second Impact happened. A meteor was about to fall on Earth, and a powerful robot called HALO was built to stop it. It failed and exploded, which messed up a lot of Earth. The fragments of the meteor messed it up further. Then the Festum went to town and various governments started to fight for power, throwing nukes and other best toys they had around, which... you get the idea.

That was fifteen years ago. I was five when it happened.