Now try looking at the rest of history. Genocide, slavery, war, corruption, oppression, and misogyny are the norm.
You ask for just one day where things were perfect. How tragic, I think, that you see no triumph in the day of July 4th, 1776, when the colonial elite declared that all men were equal and had rights government could not legitimately violate. And you see no triumph in the day that slavery was banished. And you see no triumph in the many separate days that American men elected to give their wives and sisters and daughters the right to vote. And you see no triumph in the day fascism was defeated in WW2. And you see no triumph in the day we passed the civil rights act. And I could go on...
But none of those days were perfect. And none of those movements won by screening their supporters for strict ideological purity. They struggled and fought and made their case for common humanity and after great sacrificed prevailed.
America is not perfect and never will be, just like you and I aren't perfect. But America is a place where the fight can be had and the good guys might, just might, prevail.