On what date did Disney's Magic Kingdom open?

Disneyland in Anaheim opened in 1955.

Disneyland Anaheim was the first Disney park...It's the best in quality and detail, but it's the 2nd most popular theme park in the county behind Magic Kingdom, only because Disney World is more advertised and it's guests are mostly tourist who have only been to one park and automatically think it's the best. Disney has parks in (order from date opened) Anaheim, Orlando, Tokyo, Paris, Hong Kong and soon in Shanghai. Disneyland Anaheim is also the Only park that Walt Disney got to see finished and walked in, he died before WDW opened...but he never even got to see it getting built.