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From the article:
Disney World, the largest theme park in the world, welcomed its first guests on Oct. 1, 1971. Over the next five decades the park — which covers more than 40 square miles in central Florida — grew into an entertainment complex that includes four theme parks, two waterparks, golf courses, a shopping destination and 27 resort hotels.
Before Disney World and Disneyland, amusement parks had existed for centuries. But Walt Disney came up with a new concept, the theme park, and it connected deeply with visitors.
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