PC Most of world randomly corrupted in pre-hardmode?

If a large majority of your world's surface is corrupted. I would try building a few houses a fair distance high into the sky (where you can't see the Corrupt background) or somewhere underground such as within the Jungle or Underworld.

Your houses just need the bare minimum to get NPCs in. This way you can get the Guide and Dryad potentially and from there you can summon the Wall of Flesh or get purification powder from the Dryad to purify your surface.
 
My curiosity is striking. How did the world managed to be randomly corrupted? Did it spawn that way?
 
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