The reason is arbitrary. The Prime Meridian runs through England, which (along with the anti-meridian which is on the exact opposite side of the globe) is the imaginary line that we decided divided “east” from “west”. If that line were instead chosen at, say, Denver, then maps would center on Denver instead.
The line was set in England because the navigation system we use was developed by people in Europe who all agreed on England as the place to put it.
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