The NHL's American Division was formed after expansion in 1926. The division existed for 12 seasons until 1938.
Boston Bruins
Chicago Blackhawks
Detroit Cougars
New York Rangers
Pittsburgh Pirates
The American Division is formed as the result of NHL realignment
The Chicago Blackhawks (formerly the Portland Rosebuds) and the Detroit Cougars (formerly the Victoria Cougars) were admitted from the Western Hockey League
The New York Rangers are added as an expansion team
Boston Bruins
Chicago Blackhawks
Detroit Falcons
New York Rangers
Philadelphia Quakers
The Detroit Cougars change their name to the Detroit Falcons
The Pittsburgh Pirates moved to Philadelphia, Pennsylvania to become the Philadelphia Quakers
Boston Bruins
Chicago Blackhawks
Detroit Falcons
New York Rangers
The Philadelphia Quakers folded due to financial problems
Boston Bruins
Chicago Blackhawks
Detroit Red Wings
New York Rangers
The Detroit Falcons change their name to the Detroit Red Wings
The league collapsed into one single table, reverting to the format of the 1925–26 season, after the Montreal Maroons folded in 1938.
1927—New York Rangers
1928—Boston Bruins
1929—Boston Bruins
1930—Boston Bruins
1931—Boston Bruins
1932—New York Rangers
1933—Boston Bruins
1934—Detroit Red Wings
1935—Boston Bruins
1936—Detroit Red Wings
1937—Detroit Red Wings
1938—Boston Bruins
1928—New York Rangers
1929—Boston Bruins
1933—New York Rangers
1934—Chicago Black Hawks
1936—Detroit Red Wings
1937—Detroit Red Wings
1938—Chicago Black Hawks