Serhii Plokhii presented his latest book, "The Last Empire: The Final Days of the Soviet Union." Using recently declassified documents and original interviews, Plokhii examines the events leading up to the collapse of the Soviet Union. He reveals that it was largely inter-republic disunity and not American influence that led to the surprising dissolution of one of the world's two superpowers. Plokhii provides new insight into the events leading up to 1991, which continue to reverberate to the present day.