The St. Louis Cardinals are an American professional baseball team based in St. Louis, Missouri. The Cardinals compete in Major League Baseball (MLB) as a member club of the National League (NL) Central division. Busch Stadium has been their home ballpark since 2006. With origins as one of the early professional baseball clubs in St. Louis, entrepreneur Chris von der Ahe purchased a barnstorming club in 1881, then known as the Brown Stockings, and established them as charter members of the American Association (AA) the following season. Upon the discontinuation of the AA, St. Louis joined the NL in 1892; at that time, they were called the Browns and the Perfectos before they were officially renamed as the Cardinals in 1900. 

One of the most successful franchises in baseball history, the Cardinals have won 11 World Series championships, the second-most in Major League Baseball and most in the National League. Their 19 National League pennants rank third in NL history. In addition, St. Louis has won 13 division titles in the East and Central divisions. While still in the AA, St. Louis won four league championships, qualifying them to play in a forerunner of the World Series. They tied in 1885 and won outright in 1886, both times against Chicago, in the first meetings of the Cardinals–Cubs rivalry that continues to this day.
are they a member of the American League?
The Cardinals compete in Major League Baseball (MLB) as a member club of the National League (NL) 