Andrew "Rube" Foster (September 17, 1879 - December 9, 1930) was an American baseball player, manager, and executive in the Negro leagues. He was elected to the Baseball Hall of Fame in 1981. Foster, considered by historians to have been perhaps the best African-American pitcher of the first decade of the 1900s, also founded and managed the Chicago American Giants, one of the most successful black baseball teams of the pre-integration era. Most notably, he organized the Negro National League, the first long-lasting professional league for African-American ballplayers, which operated from 1920 to 1931.

In 1907, Foster's manager Sol White published his Official Baseball Guide: History of Colored Baseball, with Foster contributing an article on "How to Pitch." However, before the season began, he and several other stars (including, most importantly, the outfielder Pete Hill) left the Philadelphia Giants for the Chicago Leland Giants, with Foster named playing manager. Under his leadership, the Lelands won 110 games (including 48 straight) and lost only ten, and took the Chicago City League pennant. The following season the Lelands tied a national championship series with the Philadelphia Giants, each team winning three games.  Foster suffered a broken leg in July 1909, but rushed himself back into the lineup in time for an October exhibition series against the Chicago Cubs. Foster, pitching the second game, squandered a 5-2 lead in the ninth inning, then lost the game on a controversial play when a Cubs runner stole home while Foster was arguing with the umpire. The Lelands lost the series, three games to nothing. The Lelands also lost the unofficial western black championship to the St. Paul Colored Gophers.  In 1910, Foster wrested legal control of the team from its founder, Frank Leland. He proceeded to put together the team he later considered his finest. He signed John Henry Lloyd away from the Philadelphia Giants; along with Hill, second baseman Grant Johnson, catcher Bruce Petway, and pitchers Frank Wickware and Pat Dougherty, Lloyd sparked the Lelands to a 123-6 record (with Foster himself contributing a 13-2 record on the mound).Answer this question using a quote from the following article:

Did the Leland Giants win any championships beyond the Chicago City pennant?
The following season the Lelands tied a national championship series with the Philadelphia Giants, each team winning three games.