Ohh..bud..there is..its because North can be clearly distinguished from the other poles thanks to the magnetic field of the Earth..which makes it a constant..so building a map with the North..a constant..which can also be a stand in for the North Star..which most of Europe sailors used was just logical for them.. in other parts like India East was the top..and I think in Egypt South was the top..but somewhere during the European expansion..(colonialism) ..all the maps have been set to suit them..thus the standard North top maps were made..