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| 1990, Feb. 15 |
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| U.S. president George Bush and the presidents of Peru, Colombia, and Bolivia signed an agreement in Cartagena pledging cooperation in the drug war. | 1 |
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| March 19 |
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| M-19 signed a peace accord with the government, giving its members amnesty and a right to political representation. This left six major rebel groups with 10,000 members. | 2 |
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| March 22 |
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| Bernardo Jaramillo, Popular Union presidential candidate, was assassinated in the Bogotá airport. A month later, M-19 candidate Carlos Pizarro was murdered. | 3 |
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| May |
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| Liberal César Gaviria won the presidential elections. He faced the task of dealing with both guerrilla groups and the drug lords. | 4 |
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| Dec. 18 |
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| After months of negotiations, Medellín drug cartel leader Fabio Ochoa Vásquez surrendered to authorities. | 5 |
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