It’s 1895 and Chicago’s a boom town that’s overflowing with pharmacies. But one drugstore is about to emerge from the city’s mass of small-time drugstores and become a national force. 

It’s name is Walgreens and by the late 20th century it will be spreading nationwide and looking unbeatable.

But then a multi-billion-dollar shoe company bets everything on a little New England drugstore chain called CVS.

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