[2020] lore?

There is some very vague backstory to it all, but nothing concretely made yet. EG; This all takes place after what amounts to a World War 3 scenario which has irradiated much of the area surrounding the area the game takes place in, and is also the cause of the wasteland biome. Probably the radiation made some kind of super virus which caused zombies, which lead to a bunch of other stuff.

We, the player, come into the picture a year or ten down the line, many places are already ransacked, many survivors before us have tried and failed, etc.