If you aren't going to look at the history behind it, and refuse to acknowledge it, I'm not going to do the work for you.
Why is there a NAACP?
NAACP - History
When someone says "American", or "All American Boy", they don't picture a latino, a boy of Indian origin, a Asian American. They picture Ritchie Cunningham, or Brad Pitt. They don't picture Denzel Washington.
Back in the 60s, it was pretty common to demean blacks by calling them the n word. In response, they called themselves African American, to have pride in the heritage. This angers the white people today. "I don't call myself Euro-American!!!"
Yeah. You don't go that far. You say, "I'm Jim Flannigan. I'm Irish!!!" Or "I'm German!" or "I'm Norwegian!"
Is anyone complaining about people walking down the street celebrating their Irish heritage? No, because it is white people. That's ok.
Every year in Minneapolis, someone would write into the paper saying, "hey! How come there is a Gay Pride Parade, and no Straight Pride Parade?"
The "parade" started as a protest. It wasn't recognized by any city. People marched in protest for years, starting in the 70s, and it was recognized as a formal parade from it's growing size and political equality gains much later. In Minneapolis, it wasn't recognized until about 1990.
Does the city plan it for us? No. We make it ourselves.
You can find all of this information on the internet. You can watch Stonewall, a documentary about the movement. But that would take some work, and I am the one expected to educate such lazy people.
If one doesn't acknowledge white priviledge, and research the plethera of web sites on the topic, won't look at the history of NAACP, acknowledges that black colleges were born out of white prejudice, are ignorant of Little Rock Nine that needed the National Guard to protect and allow black children to integrate into a white school, then I can only conclude that you don't really want to know the answer. Why do they exist? Out of necessity to injustice created from white people that insist that the passing of Civil Rights made racism toward people of color magically disappear.