Alright here is my definitive list of what makes a state forgettable, feel free to add on anything I'm missing.
1. No one travels there or through there to get to another place.
2. No professional sport teams or P5 NCAA programs.
3. No famous movies/historical events took place there.
4. You have to google their most famous resident.
5. They have absolutely zero impact on the daily lives of most americans, like the whole state could disappear and it would take CNN 3 days to write an article called "Where did Delaware go?"