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On National Chocolate Milkshake Day, Let's Drink to Chicago's Prohibition-Era Entrepreneurs

What the rise of the milkshake had to do with Prohibition, Chicago's South Side, and a local pharmacy chain called Walgreens.

Happy National Chocolate Milkshake Day!

OK, it's a "holiday" whipped up by the dairy lobby. But it’s also an excuse to remember Prohibition-era Chicago's role in creating this frothy favorite.