To help listeners understand the origins of the social unrest of May & June 2020, we created this special supplemental episode that provides historical background & context for turbulent current events. The large turnout & enthusiasm for the current Black Lives Matter protests occurred because of social developments that have been festering for decades: growing police militarization, continuing racial inequities, failing US health care preparation for a pandemic, escalating economic inequality, & media-driven political polarization. In addition to discussing the long-term & short-term causes of the protest movement, this episode discusses conflicts between protesters, counter-protesters, & law enforcement, and examines the public perceptions of these demonstrations. The program concludes with informed speculations about the movement's likely impact on the future of American politics & society.