| The Encyclopedia of World History. 2001. |
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| 1952, March 3 |
| | | By popular vote, Puerto Rico ratified its new constitution. It made the island a free state in association with the United States. | 1 |
| | | July 4 |
| | | Gov. Muñoz Marín proclaimed the Commonwealth of Puerto Rico one day after Pres. Truman had signed a congressional resolution approving its constitution. | 2 |
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| The Encyclopedia of World History, Sixth
edition. Peter N. Stearns, general editor. Copyright © 2001 by Houghton Mifflin Company. Maps by Mary Reilly, copyright © 2001 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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