It's still APH... The first two letters just stand for something different.

This account was made by two bored AP European History students trying to remedy the dullness of test prep books (and not to mention the complete lack of historically accurate Hetalia fiction).

Our class's textbook is Western Civilization (6th edition) by Jackson J. Spielvogel, so that will be the source of most of the information, but there may be other sources used as well.

Have fun and learn for a change! :)