Dual Nationality for Mexicans

In 1995, the government of Mexico began seriously to consider amending its Constitution to allow for dual nationality, whereby a Mexican could be recognized as holding two nationalities at the same time. Legally, the concept prohibits Mexican nationals from voluntarily abandoning their nationality, even if they opt to become naturalized citizens of another country. Two questions arise as one considers dual nationality in Mexico. First, what has really influenced the philosophical change in Mexico regarding dual nationality?

Second, why has Mexico started considering dual nationality now?