When I first heard that Newfoundland didn't become a part of Canada until 1949, I thought its name meant that it was a land only first found at that time, and was previously unknown.
A childhood belief about places

others believed things like this
- I used to believe that you could create money (that you didn't previously have) by writing a check.Anon
- When I was a child, I used to believe that Catalonia was the unique part of land of the world.Anon
- Living near Canada's border without cable, I didn't know I was American. — Romania
- I used to think that
"The land of make believe"
was
"The land of baked beans."— Baked Bean! - I thought the England was EDGE-land but england was ENG-landAnon
- When I was a child I always thought Canada was apart of the US... not its own country!! — clueless youngster