"Having lived in Texas as a youth I had been accused of murder several times and been forced to study Texas history, I thought I knew the story of its admission to the Union pretty well. But I never knew the profound importance of race to that history. In particular, I did not know that Mexico had abolished slavery and that this was a key reason for the war for Texas independence. The Texans were determined to keep their slaves and were willing to fight to the death for that right. And of course, the admission of Texas as a state was critical to the maintenance of slavery in the United States, which was threatened both economically and politically in the 1840s."
January 1, 1970
https://en.wikiquote.org/wiki/Mexican%E2%80%93American_War