No, Google doesn’t explain it. Google feeds people like you a history line with an 1865 date.
The year is 2022.
The question is how did an 1865 event emerge into the 23rd Century?
If you don’t know or don’t know enough, say “I don’t know” or “I’m not sure.”
I live in Galveston, Texas and we have known about Juneteenth as long as I can remember. Bye.
It was pretty much exclusively a Texas thing until George Floyd happened and the media was casting about for anything to use as an example of President Trump being a racist. “He never even mentioned this holiday we never heard of until it made the AP’s Today in History, the white devil.”