the race problem

I was surprised that the percentage of population who came from ethnic minority group is about 6%. I thought that many people live in there.
Probably, many countries have problems with racism. When I was elementary school student, I have classmates who came to China. They couldn't speak Japanes very well. So, I didn't talk them a lot of times. But now, I am regrets that I didn't talk to them. It is difficult to understand that other country's culture and custom. But, we should know about more each countries. we make a lot of friend all over the world!