Electricity is a fairly recent discovery. When it was discovered and formally described by science, the world was already connected to a decent degree, so as the knowledge of electricity was passed along, so were the units.

On the other hand, physical quantities like distances and weights were measured independently by different cultures basically since the dawn of civilization, so every culture developed their own set of units.

If electricity were discovered by say, ancient Greeks and ancient Chinese, we would most likely have two different sets of units for electricity.