mr. kershaw: it is a treasure trove. i was very fortunate he allowed me to use so much of what he gave me. thank you for being such a fantastic audience. [applause] >> you are watching american 48 hours of programming on american history every weekend on cspan3. follow us on twitter for information on our schedule of upcoming programs and to keep up with the latest history news. >> now, a roundtable of public historians and successes of remembering the civil war 150 years later and how it compared to earlier anniversary celebrations. they describe the changes in how parks have interpreted the civil war era over the years and challenges in engaging younger generations and minority groups. the emerging civil war blog hosted this event. it is about an hour and a half.

mr. kershaw: it is a treasure trove. i was very fortunate he allowed me to use so much of what he gave me. thank you for being such a fantastic audience. [applause] you are >> you watching american history tv. follow us on twitter at sign -- a@cspan history. and cuba normalized .-matic relations up next on american history tv. peter kornbluh and william leogrande, co-author of "back channel to cuba: the hidden history of negotiation between havana and washington" discussed the o-matic relations. between the u.s. and cuba. they also considered what the future relationship between the two countries may look like. sony andnt -- this in associates hosted this event. it is an hour and 40 minutes. thank you for having us. i want to start with several coincidences