On The Gist, Manisha Sinha joins us to discuss the long roots of the abolitionist movement in American history.She’s the author of The Slave’s Cause: A History of Abolition. For the Spiel, there’s no backsies or whoopsies for presidents. Today’s sponsor: Betterment, the largest automated investing service—managing billions of dollars for people just like you. Get up to six months of investing free when you go to Betterment.com/gist.  Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.Learn more about your ad choices. Visit megaphone.fm/adchoices