Diversity is fool's gold.
1) In China, 90% of the populations are native Chinese.
Demographics of China, Wiki
In Japan, 98% of the populations are native Japanese.
Demographics of japan, Wiki
In Korea, almost 100% of the population are native Korean.
South Korea is a homogeneous society.
Demographics of South Korea, Wiki
2) In 1950, white population was about 90% in the USA.
in 2014, white population is about 60% in the USA
In 1980, white population was 90% in Canada.
In 2010, white population was 60% in Canada..
European Canadian, Wikipedia