How did the formation of the national action party change mexican politic?

The National Action Party (Spanish: Partido Acción Nacional, PAN), founded in 1939, is one of the three main political parties in Mexico. Since the 1980s has been an important political party winning local, state, and national elections. In 2000, PAN candidate Vicente Fox was elected for a six-year Presidential term; in 2006, PAN candidate Felipe Calderón succeeded Fox in presidency.

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Hoped he would accept their demands and end the violence