Uruguay has a multi-party system with three dominant political parties, with extreme difficulty for anybody to achieve electoral success under the banner of any other party. It may be said that to some extent the 'fault lines' of Uruguay's politics have run within the historically dominant Colorado and National parties. Uruguay underwent an intermittent series of civil wars through much of the 19th century, which ended in 1904, and the party system has in the past reflected regional loyalties which emerged during that period. However, with the eclipse in 2004 of the Colorado Party and, indeed, the cooperation of the Colorado and National parties during the 1999 Presidential elections, some realignment of traditional loyalties has come into play. However, the independence of both parties is