By 1963, when Rangers governor William M. Jennings first introduced to his peers the idea of expanding the NHL, other major sports leagues were growing: Major League Baseball and the National Football League were adding teams, while the American Football League was becoming an attractive alternative to the NFL.
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With the suspension of the Americans, this was the inaugural season of the so-called Original Six era, with the NHL consisting of six teams (the Boston Bruins, Chicago Black Hawks, Detroit Red Wings, Montreal Canadiens, New York Rangers, and Toronto Maple Leafs).