Harley-Davidson headquarters on Milwaukee’s Juneau Avenue is to America’s motorcycle culture what the Capitoline Hill was to Ancient Rome. The edicts handed down from the red brick building tucked into the Martin Drive neighborhood affect thousands of people across the country, from the company’s millions of customers, to its thousands of dealers and thousands of third-party motorcycle parts and riding gear makers. Sturgis, S.D., is a close second, with its annual rally attracting upwards of half-a-million some years, but all of that is predicated on people buying motorcycles manufactured in Milwaukee.