Donald Trump mistakenly thinks he “made Juneteenth very famous” and that “nobody had ever heard of it” until he planned a rally in Tulsa, originally intended to take place today, June 19th. The Daily Show set out to school him and anyone else that needs an explainer of the holiday and its 155-year history. Daily Show correspondent “Dulcé Sloan explains exactly what Juneteenth is, why it’s celebrated, and how it should be commemorated.” Watch above.