I am not sure. But Maybe someone else can help. I am sorry!!!!
It is important so that some people be ethnic so that those cultures and beliefs do not die off but it is also important for people to evolve as well which is why it is important for some to not be ethnic.
Found this:
Any object moving in a circle or along a curve is changing velocity (accelerating) even if its speed is constant, because its direction is changing. ... An object moving in a circular path at constant speed is a simple example of acceleration at constant speed because its velocity is changing direction.
