America undone: Broadcaster James Naughtie on how disunited States are going back to an uncertain future

© John Minchillo/AP/Shutterstock50 years on from the Kent University, Ohio, protests against Vietnam in May 1970 when the National Guard fired on crowds killing four students, Black Lives Matter protesters clash with police in Minneapolis
50 years on from the Kent University, Ohio, protests against Vietnam in May 1970 when the National Guard fired on crowds killing four students, Black Lives Matter protesters clash with police in Minneapolis