The Mexican Liberal Party (PLM; Spanish: Partido Liberal Mexicano) was started in August 1900 when engineer Camilo Arriaga published a manifesto entitled Invitacion al Partido Liberal (Invitation to the Liberal Party). The invitation was addressed to Mexican liberals who were dissatisfied with the way the Porfirio Díaz government was deviating from the liberal Constitution of 1857. Arriaga called on Mexican liberals to form local liberal clubs, which would then send delegates to a liberal convention.