The ABC Show: "Who are you?" (Black American edition)

I came across a recent video of a Dr. Rachel Yehuda, in which she described how trauma can permanently affect the DNA of a person, and that affect be passed down thru generations. How might trauma have affected the descendents of slavery??

https://www.youtube.com/watch?v=Rv4IBEQYwqg

https://www.theguardian.com/science/2015/aug/21/study-of-holocaust-survivors-finds-trauma-passed-on-to-childrens-genes?CMP=fb_gu

http://www.rawstory.com/2015/10/slavery-in-america-was-much-worse-than-you-probably-imagined/

http://www.telegraph.co.uk/news/science/science-news/10486479/Phobias-may-be-memories-passed-down-in-genes-from-ancestors.html

http://www.bbc.com/news/health-13119545