Basically fm took over because it sounds way better
Switch to an am station next time in your car.
Am has longer range though. So the early days an stations made more sense. A few stations could service most of the country
But when you listen to music you want it to be higher quality. So fm became popular for radio as we know it as we moved from talk shows and news and sports casts to mainly music on the radio.
Am is still generally where you get talks shows still though.
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