http://www.historyworld.net/wrldhis/PlainTextHistories.asp?groupid=1737&HistoryID=ab49
"It is calculated that as many as 200,000 Cubans and Spaniards die during the ten years of the war. Eventually, in 1878, peace is restored when the Spanish government promises extensive reforms including the abolition of slavery. This is granted in stages during the 1880s, but other promises are broken."
http://encarta.msn.com/encyclopedia_761595536_2/Spanish_Empire.html
"The Spanish colonists tended to settle where the native population was most plentiful. These tended to be urban areas and many were sites where the Spanish had built their own city on an existing native city or town. Cortés provided a model for this when he built Mexico City over the conquered Aztec capital of Tenochtitlán. He introduced to Mexico many crops and industries familiar to Spaniards, such as sugar, silk, cattle, wheat, and cotton, and he instituted gold and silver mining and the slave trade."
Yes, the Spanish brought African slaves to Mexico, but the point that I was making was that even in the case of the African slaves, once they had been bought by a Mexican, they were essentially working under the conditions of indentured servants. They were treated terribly (but so were indentured servants, even in the US), however, they had certain rights, such as the right to marry, that true chattel slaves (in the US or even in other parts of Latin America) did not have.