America is in the grip of a wave of violence not seen in a generation, after yet another death of a black person in police custody.

In dozens of cities, anger and exasperation are building, and in some places curfews have been introduced and the National Guard called in.

The deadly unrest was sparked after footage of a Minneapolis police officer kneeling on 46-year-old George Floyd's neck for almost nine minutes spread around the world.

While four officers have now been fired and one charged with third degree murder, the protestors say it isn't enough.

So is there any way America's racial chasm can be bridged?

Today on The Signal, we piece together the final minutes of George Floyd's life, and speak with an author who says future generations will look back on this period and conclude America has failed.

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Donald Earl Collins, author and professorial lecturer in history and American Studies, American University, Washington, DC