The Jagged Orbit

The book was written nearly 50 years ago, with the locus of the story set around this time era. It depicts a US society divided by race, colour, and to lesser extent religion. Commercialism controls the media, and the sale of arms and weapons to the public is rampant, and controlled by a Mafia-like organisation. Civil unrest is widespread, and violence is worsening. The President is publicity seeking fool.
John Brunner must have been prescient.