Federal League was the least Major League that played after the National and American League started. The Federal League stated as the United States League in 1912, move to Independent status in 1913 and a Major League in 1914 and 1915. (See the United States League for teams)
1913 Chicago, Cleveland, Covington, Indianapolis, Pittsburgh and St Louis started this League. During the Season Covington move to Kansas City
1914 Baltimore, Brooklyn and Buffalo enter the League and Clevleand has left the league.
1915 Newark enter the league and Indianapolis has left the league.