All the schools would be called Hogwarts
All the summer schools/camps would be called Camp Half Blood
Wars won't even be proper wars they'd just be arguments about which ship is best
Tumblr would become the main source of happiness
Approx 67% of the male babies would be named Percy, Harry, Peeta, Cato, Jace, Tobias, Four, etc.
The currency would probably be books
Every table would be made out of mahogany
Countries would probably be named after fictional characters