The Pilgrims landed on Plymouth Rock because they needed more beer

Susan Cheever, author of "Drinking in America: Our Secret History," shares an oft-forgotten detail of the Pilgrims' arrival at Plymouth Rock. Due to the unsafe drinking water, passengers on the Mayflower drank beer as a main hydration source - each person was rationed a gallon per day. They started to run out as the ship approached Plymouth Rock.

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