sentences:  When it was founded in 1929, the party structure created a means to control political power and to perpetuate it with regular elections validating the party's choice.Before the party was founded, political parties were not generally the means in which to achieve the presidency.The creation of the party in the wake of the assassination of revolutionary general, former president, and in 1928 president-elect Alvaro Obregón had laid bare the problem of presidential succession with no institutional structures.