How Fallout 3 Teases Where Fallout 76 May Be Set

Bethesda revealed Fallout 76, the latest entry in its RPG series, with a brief teaser trailer and very few details about the game. But thanks to the franchise's past, we may already have an idea of where Fallout 76 is set.
Yes, the teaser trailer opens with John Denver's "Take Me Home, Country Roads," which mentions West Virginia, and it's very likely Fallout 76 could be set there. However, the game may extend outside the boundaries of just a single state, given some details from Fallout 3.
Wher