Untill the first world war which company was the worlds largest motorcycle manufacturer?
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Indian
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Harley-Davidson
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Yamaha
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Triumph
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DKU
Before World War I, Indian (the Indian Motocycle Manufacturing Company) was indeed the world's largest motorcycle manufacturer, producing over 20,000 bikes per year in 1911. Harley-Davidson, Yamaha, and Triumph became dominant later in the 20th century.
Before World War I, the Indian Motocycle Manufacturing Company (based in Springfield, Massachusetts) was the largest motorcycle manufacturer in the world, producing tens of thousands of units annually and dominating racing circuits of the era. Harley-Davidson grew to prominence later, especially after WWI and through the 1920s-30s, eventually overtaking Indian. Yamaha didn't enter motorcycle production until 1955, long after this period, ruling it out entirely. Triumph, a British marque, was a smaller player at the time relative to Indian's output. 'DKU' isn't a real historical motorcycle manufacturer (likely a garbled reference to DKW, a German marque, which was also not the largest). So 'Indian' is correct based on production volume and market dominance pre-WWI.