Why was it so difficult for Mexico to achieve peace and stability?

A primary threat to Mexico's democratic transition is the so-called old guard of the PRI, ... Together with the PRI's difficulty in coming to terms with political reform, ... and appear to be committed to a peaceful resolution of the Chiapas crisis.

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A primary threat to Mexico's democratic transition is the so-called old guard of the PRI, ... Together with the PRI's difficulty in coming to terms with political reform, ... and appear to be committed to a peaceful resolution of the Chiapas crisis.

missouri compromise of 1820 which prohibited slavery

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