Answer: i think is is mostly a moral question, so it varies
Explanation: when you think black people are free and their not, but then the Enmancipation proclimation TECHNICALLY got passed as a bill DURING the civil war when the confederetes was still a thing, so technically slaves were free when that passed making another 25% or so of the population free, but then we need to look towards freeing the 50% of the population of U.S. or the women who neither had the right to vote like men. So i would say that the official Independence day would be some-where is 1920 when Congress (or whatever government policy got passed) gave women the right to vote, so the question (my opinion and for me) would not be whether we change our original independence day, but recognize those women and black men who have got their own independence day