Known to WHO, exactly? Before a couple of years ago, most people had never even heard of the term 'Juneteenth', let alone recognize it as anything meaningful.
Meh. Democrats just wish to re-write their pro-slavery history (which continues to this very day).
On their official party website, they refuse to highlight anything significant that they did within the first 100 years of their existence as a party (they begin their highlights with the 1920s, trying to take credit for the women's suffrage movement, which was, you guessed it, actually Republican pioneered and pushed). They also suck at mathematics, as their site claims that their party has existed for "more than 200 years", even though 200 years ago from today would be 1823, and they didn't exist as a party until 1828.
Feel free to peruse through it if you want a good laugh:
https://democrats.org/who-we-are/our-history/
Has it? I'm sure that, as recently as five years ago, hardly anyone (even African Americans) knew what 'Juneteenth' was. I had never even heard of it myself until the chatter about making it a federal holiday.
Has it?
Outside of media propaganda about it, IOW "in the real world", I haven't seen any significant increase (from zero) in celebration of Juneteenth. I recall recently seeing one small banner on a building of the word 'Juneteenth' (in a very liberal area). Other than that? Literally nothing.
Before a couple years ago, most people (including those of us who are dark-skinned) hadn't even heard of the term 'Juneteenth', let alone celebrated anything with regard to it. If they wish to celebrate anything with regard to emancipation, they should be celebrating the Republicans who freed them from their chains.