Henry L. Stilton, US Secretary of War, recalling his attempt to persuade Archibald MacLeish not to speak out against the Army's discrimination against blacks, wrote the following in his diary on January 24, 1942:

I pointed out that what these foolish leaders of the colored race are seeking is at the bottom social equality, and I pointed out the basic impossibility of social equality because of the impossibility of race mixture by marriage. - Henry L. Stimson, US Secretary of War

Reference: Personal Justice Denied: Report of the Commission on Wartime Relocation and Internment of Civilians, part 1, chapter 1, page 46.

Looking at the two "impossibilities" separately: In the context of the social environment in the United States, it is easy to understand the "impossibility of social equality", but what I don't understand is the "impossibility of race mixture by marriage".

From my understanding, historical (and contemporary) European-Americans believe in race as such: if person of "race A" marries person of "race B", and they produce offspring, the children will be considered "mixed race". In light of this, why did he believe in the "impossibility of race mixture by marriage"?

Also, why did he believe that the "impossibility of social equality" is due to "the impossibility of race mixture by marriage"?

(Note: I am rather new to the history of the Americas).

closed as off-topic by Denis de Bernardy, Jos, José Carlos Santos, Steve Bird, KorvinStarmast Jul 27 at 1:18

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    Perhaps I'm missing something here, but I'm not sure how one can separate marriage from the social environment. – Lars Bosteen Jul 21 at 3:11
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    I suspect that it's a reference to the segregation and anti-miscegenation laws which were in place in many states at that time. Since the classification was binary (white / colored), there was no room for "mixed-race". I'd guess that under those laws, children of mixed-race couples (where such marriages were permitted) would simply have been classified as "colored". – sempaiscuba Jul 21 at 3:53
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    @sempaiscuba I see it now. e.g. In contemporary America, Barack Obama is categorized as "black" rather than "mixed race", reflecting a strictly binary categorization. – Flux Jul 21 at 5:17