I lived on the east coast of the US. When I was watching westerns at the movies, I thought the time frame of the story was contempory. I thought if you went "out West", there would be horses, wagons and no automobles and everyone lived like that as in the western movies.
A childhood belief about places

others believed things like this
- I used to think actors in movies sometimes had to actually die to make the movies look real.— Dero
- It never occured to me as a child that teachers lived in houses. I thought they lived at school...— Heidi, Pittsburgh, PA
- I thought that there was a law that all movies had to have a happy ending— Quatsch
- When a soldiers went AWOL in the movies, I thought they physically climbed over "A Wall".— D Rumsfeld
- For along time I thought the Middle East and Eastern Europe were just different names for the same place!— Helllowerer
- I thought that psychological torture involved forcing people to watch really sad movies!— Elviessa