There are those who want to replace July 4th with Juneteenth. Ignore the plotters because we can, and should, celebrate both with good conscience. Freedom from the barbarism of slavery is certainly as worth celebrating— by both whites and blacks — as our freedom from the Brits.
While I'm on my soapbox, much of the abolitionist argument had an element of blacks and whites being in it together. When white Americans were captured into slavery by Barbary pirates, it inflamed Americans. The abolitionists here used that to say that slavery of whites is wrong and worth getting mad about, just like slavery of blacks. One of the most vocal abolitionists was Captain James Riley of the cargo ship Commerce -- a white man who was captured as a slave, escaped, and used his experience to push abolitionism. The 300K to 500K black slaves brought to what we today call the U.S. was trumped by the 700K to 1.2 million whites captured by Berber pirates and brought to north Africa as slaves. People back then knew it was a problem for both races and the abolitionists had no problem reminding people as such.