Texas Treasures - Slavery - Texas State LibraryThe Mexican government was opposed to slavery, but even so, there were 5000 slaves in Texas by the time of the Texas Revolution in 1836. By the time of annexation a decade later, there were 30,000; by 1860, the census found 182,566 slaves -- over 30% of the total population of the state. Most slaves came to Texas with their owners, and the vast majority lived on large cotton plantations in East Texas. When the Civil War came, Texas was not invaded, and the slaves continued to live and work as they had before. They realized that a Union victory would mean their liberation, and they listened for news as best they could and passed the word of any developments. It was not until June 19, 1865, that Union forces occupied Texas and officially freed the slaves. The day would be celebrated in the years to come as "Juneteenth."