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| 1958–59 |
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| After a national railway strike grew to include teachers, farmers, and factory workers, the government used the military to suppress the strike and jail labor leaders. Many remained in prison long after peace was restored, including railway union leader Demetrio Vallejo, imprisoned until 1971. | 1 |
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| 1959, Feb. 19–20 |
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| Pres. Mateos and U.S. president Dwight D. Eisenhower, conferring in Acapulco, Mexico, agreed on construction of the Diablo Dam and on U.S.-Mexico economic collaboration. | 2 |
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| 1964, July |
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| Election of Gustavo Díaz Ordaz (PRI candidate) as president. | 3 |
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| 1968, Sept |
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| Major STUDENT DEMONSTRATIONS took place on the eve of the international Olympic Games in Mexico City. Demanding a more democratic government and the release of political prisoners, students occupied the National University and proclaimed a strike. The government, wanting to ensure peace for the Olympics, called out the army to suppress the protests. | 4 |
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| Oct. 2 |
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| During a protest by unarmed demonstrators in the Plaza Tlateloco, the army opened fire, killing approximately 500 and injuring an additional 2,500. Over 1,500 students, professors, and other intellectuals were arrested, and over 100 were held without trial. | 5 |
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