Why is it diversity for white countries, and white people get genocided in South Africa and Zimbabwe?
That is true. Out of the dozens of countries where whites are currently in majority position, the percentage of white population is stable in only one country (Belarus).
USA, which had a Non-Hispanic White population of 83.5% in 1970 is now just 63.7% white. In countries such as Romania and Hungary, the population growth of the Roma and low birth rates among the natives are resulting in decreasing share of whites.