I recall learning somewhere, years ago, that it's primarily a result of the industrial revolution and prevailing winds. As industrial pollution increased, the prevailing winds primarily carried it north and east from city cores, which made the south and west more desirable. Now that visible pollution is less of a concern, I imagine it continues through inertia (class, infratructure, yada yada).
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Note to self: "The plural of anecdote is not evidence."
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