popular public figures. .eople listen to what they say announcer: well, we will end it there, william seale. seale: thank you, john. announcer: and you are watching american history tv on c-span3. announcer: a live conference on reconstruction and the legacy of the civil war. topics include refugee camps, career after the civil war, and reconstruction in the north. about theso hear return of the confederate veteran and the origins of the lost cause. it is hosted by the civil war institute from gettysburg, pennsylvania, coverage beginning at 1:00 p.m. eastern time. reconstruction and the legacy of the civil war, only on american history tv here on c-span3. announcer: exploring the history of the united states through objects. up next, we visit capitol hill and ak to a historian curator about the history of african americans in congress in the 19th mr. wasniewski: the story is not one everybody is familiar with. we had 22 african-americans served between 1870 and 1901. 20 in the house, two in the senate. it has to do with the role of congress during the civil war, and in the decade after. dur

williams has more. >> reporter: the deadliest attacks, the cia director said he would be surprised if the terror group isn't plotting attacks overseas and here at home. >> if anybody here believes the u.s. homeland is sealed and isil would not consider that i would guard against that. >> reporter: he and other intelligence officials said the battle against isis has not reduced the global reach. in the u.s. the biggest threat has been people inspired to attack by the group's relentless propaganda. they concluded that the husband and wife that killed 14 people in san bernardino were pledged by isis. a top state department official said even though isis is undergoing mill their pressure -- >> as they are losing this kind of state they are creating they will try to inspire these lone wolf-type of attacks. >> reporter: agents arrested 93 people on isis related charges. average age is 26. more than half were accused of trying to get to syria to join isis. they have seen that number drop significantly in the last several months. with two overseas airport attacks in the last four months there are concerns over how u.s. airports can be made safer. tom has more. >> reporter: at select airports, miami, new york, atl