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| 1960, Nov. 8 |
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| Gov. Muñoz Marín and his Popular Democratic Party (PPD) won all but one of 83 precincts. | 1 |
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| 1964, Feb. 24 |
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| U.S. president Lyndon Johnson signed a bill creating a 13-member committee to study the political future of Puerto Rico. The island continued to experience both rapid population and economic growth. | 2 |
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| 1967, July 16 |
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| In the largest political rally in Puerto Rican history, thousands protested the upcoming statehood referendum. It represented an upsurge of the reinvigorated nationalist Left. Composed mostly of students, the Pro-Independence Movement (the precursor to the Puerto Rican Socialist Party) had ties with leftist movements in the U.S., where approximately 40 percent of Puerto Ricans resided. The large U.S.-based population retained strong cultural ties to the island. | 3 |
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| July 23 |
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| In a popular referendum on the future status of the island, over 60 percent voted for continuance as a commonwealth associated with the U.S. The vote for independence was negligible. | 4 |
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