i.m. destler, the author inn chateau the oval office profile of the national security of pfizer's when the presidents they served from jfk to george w. bush. thanks for your time. >> it's been a pleasure. thank you for having me. the making of africa and america is the name of the book. professor year the university of maryland is the author and the subtitle for great migrations i gave the title greater recourse the trans-atlantic slave trade in the first middle passage, the movement of some 400,000 african to the mainland north america. second, migration is the internals late trade the movement over a million the old south as it is sometimes called the black belt to the deep south, georgia, alabama, mississippi, louisiana, across the mississippi river. third, great migration being the movement of black people from the deep south from the soft to the cities of the north and the 20 at century. the total is over 6 million, and of course the migration which is just beginning in 1965 that this the change if our immigration law is that have brought people of african descent from all over the wo