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The National Revolutionary Party is formed. In 1946 it is re-named the Institutional Revolutionary Party (PRI).
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Mexico declares war on Japan and Germany.
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Student demonstration in Tlatelolco, Mexico City, during the Olympic Games is fired upon by Mexican security forces. Hundreds of protestors are killed or wounded. The extent of the violence shocks the country.
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Earthquake in Mexico City kills thousands and makes many more homeless.
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Attorney-general Eduardo Medina Mora says more than 4,000 people have been killed in 18 months since President Calderon took office and declared war on drugs cartels. About 450 of the dead are police, soldiers or prosecutors, and many of the killings have been concentrated along the US border.
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Beginning of Epic Revolution, triggered by unrest amongst peasants and urban workers, who are led by Emiliano Zapata.
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US President George W Bush signs legislation to build 1,125km (700 miles) of fencing along the US-Mexico border. Mexico condemns plans for the barrier, which is intended to curb illegal immigration.
