What is the history behind Harley-Davidson?

In 1903, first Harley-Davidson motorcycle began its history in Milwaukee where the one-cylinder model was developed by Bill Harley and Arthur W Davidson. The first gasoline motorcycle was conceptualized by Merkel, Mitschell and Yale. Powered by a one-cylinder gasoline combustion engine, this motorcycle was originally built for racing. In 1917, when the United States entered into World War I, military demanded and adopted the Harleys for combat. About 15,000 machines were used during war time.
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