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In page History of Cuba:

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Under British diplomatic pressure, the Spanish government had pledged to abolish slavery.[citation needed] In this context, Black revolts in Cuba increased, and were put down with mass executions. One of the most significant was the Conspiración de la Escalera (Ladder Conspiracy) in 1843–1844. The Ladder Conspiracy involved free Black persons and enslaved, as well as white intellectuals and professionals. It is estimated that 300 Black and mixed-race persons died from torture, 78 were executed, over 600 were imprisoned and over 400 expelled from the island.[2][3] José Antonio Saco, one of Cuba's most prominent thinkers, was expelled.[4]