so it takes multiple generations of pure white to blot out the negroid/mongoloid genes you would need to have an overwhelmingly white global population already for what you are describing to work that math doesn't work considering whites are dying out, fast, while niggers, asians, indians, arabs, etc. continue to explode in population (thanks to welfare from white countries) again, just look at the typical hispanic. they are the logical conclusion of exactly what you are describing.
United States