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For those who aren't aware, "Juneteenth" is a holiday which celebrates the abolition of slavery in Texas, and more informally the abolition of slavery throughout the former Confederacy. While Congress has passed legislation observing the holiday, it's never made the jump to the national level and remains a local and/or regional holiday.
So, how do we get it there? It doesn't need to be a massive, all out celebration like the 4th of July, but something like Memorial Day or Labor Day (so, three day weekend, maybe some vague talk about the end of the Civil War) would probably be doable.