It’s because the early map designers wanted to put either Europe, Africa or the Atlantic Ocean in the middle.
For many years this was popular because it meant your main trade routes did not go off the edge of the map. Otherwise your route would go off the edge of the map and appear on the other side.
From an aesthetic point of view, if you put the America’s in the right hand side, the entire middle of the map would be the Pacific Ocean and that both looks terrible and wouldn’t be useful for navigation at the time.
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