race suicide

noun

the extinction of a racial or ethnic population that tends to result when, through the unwillingness or forbearance of its members to have children, the birthrate falls below the death rate.

Origin of race suicide

An Americanism dating back to 1900–05

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Now, though it is easy to do so, we must not belittle this cry of "Race-Suicide!"
Little Essays of Love and Virtue
Havelock Ellis
This is what "Race-Suicide" means, and we must face the fact squarely.
Little Essays of Love and Virtue
Havelock Ellis
We still find the big family in the country where bridge whist and race-suicide—cause and effect—are as yet unknown.
Papers and proceedings of the thirty-fifth general meeting of the American Library Association, 1913
Various
She brought these to Thyrsis, who was thus admitted to a view of the inner workings of the "race-suicide" mill.
Love's Pilgrimage
Upton Sinclair
Milord and milady must decide between hospitality and race-suicide, or two children and no week-end visitor.
The Comforts of Home
Ralph Bergengren