>>32780522The first game was made to appeal japanese kids and they made the region based in the the most known of the japan's regions.
Then the other 3 following gens made the same appealing to japanese public but by then they games were part of the global culture, then they made regions based on well known places of around the world to appeal kids of the places of the world who could buy the game.
Basically the place they use to base the new region is part of the appeal and adversiting of the product to sell. Product that its sold around the world.
Thats how it works