Remember the days when progress was measured not in bandwidth, but in horsepower? Of course not; you're not 100 years old. And so you never pored over this map as an impressionable teenager.
This Horsepower Map of the United States distorts the area of each state to reflect the amount of horsepower installed. Not actual horses, mind you — the year is 1933, not 1833 — but horsepower as a unit of measure for mechanical power (i.e., 1 hp = 746 watt) and ultimately industrial output.
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