A bird does not know where one country starts and another begins.
That's because birds are stupid.
In our world race is as real as the imaginary human constructed political boundaries between nations.
Politics and nationality is not the same thing, you have multi-national states, nation-states, and multi-state nations, I guess those boundaries are as 'imaginary' as the 38th parallel because everyone knows that there is no such things as North Koreans and South Koreans, just Koreans.
Race is always a complex issue because it is an ill-defined human construct and people confuse things like ethnicity and nationality and culture with race.
That sounds like something a communist would say.