Its already really bad right now in some parts of America.
In 60 years time, imagine cartels terrorizing people in California and the American southwest. Black inner city violence will exponentially worsen.
White numbers will decrease and yet they will still hold most of the wealth and the wealth inequality along race will get exponentially worst as well.
Whites will retreat into mountainous gated and armed communities and the cities will be filled with crime, corruption, and desperation. Like I said, its already like this in many parts of the country. In 40 - 60 years time it will be common everywhere and we are looking at a mix of Mexico, South Africa, and Brazil as far as how this country will be like.