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On May 15, 1940, the McDonald brothers, Richard and Maurice, opened the first McDonald’s restaurant in San Bernardino, California. Originally called “McDonald's Bar-B-Q,” it was a modest drive-in with 25 menu items. But in 1948, they revolutionized their business by streamlining operations into the “Speedee Service System,” focusing on burgers, fries, and shakes—launching a fast food model that would soon sweep across the globe. This single event laid the foundation for a multi-billion-dollar empire and fundamentally changed how the world eats.