Justin Ellis helps US cap a perfect international window with 1-0 win over Canada | USA

Before 1878, a referee trying to get players’ attention was left to waive a white handkerchief in the air. It was an imperfect practice, asking an infractor to be self-aware enough to look for a doffed doily after hard contact. The game forever changed when Joseph Hudson, a Birmingham-bred tool maker who founded Acme Whistles, showed up to an FA Cup match in 1878 with his signature product…