Even though the league struggled to stay in business during its first decade, the NHL's teams were very successful on the ice; only once, in 1925, did a team from any other league win the Stanley Cup, and by 1926 the NHL was the only league competing for the Cup.^[4] The NHL then started a process of expansion: the Boston Bruins (the first U.S.-based NHL franchise) and Montreal Maroons entered the league in 1924–25; the New York Americans and the Pittsburgh Pirates entered in the 1925–26 season; and the New York Rangers, Chicago Black Hawks (now spelled Blackhawks), and Detroit Cougars (now known as the Red Wings) entered in the 1926–27 season, raising the number of teams in the NHL to 10. The Great Depression and the onset of World War II, took a toll on the league, and by 1942 the NHL was reduced to six teams.^[5] These six teams (the Montreal Canadiens, Toronto Maple Leafs, Detroit Red Wings, Chicago Black Hawks, Boston Bruins, and New York Rangers) are collectively known as the Original Six, and for the next quarter-century were the only teams in the National Hockey League.^[6]