donald rumz feld shares his thoughts about running. and from 1994, dick cheney explores his possible run in the 1996 presidential race. >> i used to think of it as a political calculation. you would look at the landscape, try to figure out who else was going to run and what your prospects were. the more i think about it, the more it becomes a personal decision rather than a political decision. >> later at 11:30 on lectures in history, southern illinois university edwardsville history professor on the caribbean sugar trade, its role in the development of britain's atlantic colonies and its impact on race and slavery in the 1600s. >> sugar was one of the main motors of the slave trade in the americas. 75% of all africans brought to the americas in the 1600s were brought to areas where they were growing and making sugar. it was a huge business. it was some scholars argue the first industrial enterprise in the western world. >> american history tv, all weekend, every weekend, only on c-span3. >>> at the opening of this week's paris climate