Instead of spewing a incredibly short-sighted rhetoric that suggests people kill each other if they have a tribe, perhaps you should stop and think.
Let me pose it this way.
You were born a Native American, your tribe is your family, and your history. For all intents, yhey are a nation that raised you.
Around you are strangers. They come from a different nation.
They butchered your ancestors to steal what they had.
Yet, as is the way of your tribe, you try to be peaceful and considerate.
In response, some are kind to you. But, their leaders steal your water.
Not just sustinence, something special to the stories of your people.
You protest peacefully.
They react with violence.
How do you feel?
Tribes aren't something to give up. They're a part of you. Your history. Do you tell an Irishman to forget his kilt? An Englishman his Coat of Arms? Do you tell someone who's grandfather was a slave that its okay to be poor, because he's equal now?
The tribe is family, history, and nation. When your neighbour tried to sell your grandfather out for diamonds, there will be problems.
If anything, Africa shows us problems we ignore... And that with time and effort, relations can be improved. Sometimes it doesn't work. Bill kills Joe, because Joe bragged that his Da used to eat your family.
But forgetting who you are, isn't going to help.