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How did Mutt and Jeff help establish the daily black-and-white comic strip?

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The daily black-and-white comic strip was effectively inaugurated by the San Francisco Chronicle through the work of cartoonist Bud Fisher, who created the strip Mr. A. Mutt in 1907.12

Fisher’s creation, which later became known as Mutt and Jeff, helped establish the format by transitioning from its initial racetrack-themed setting into a general-interest comic. By 1915, the daily black-and-white strip had become an indispensable feature for all major newspapers, a standard that was solidified by the success and influence of Fisher's work.12