The aim: improve the average person, and increase the population of our nation to improve our economic, military and demographic ability to defeat other nations and protect our own nation.
the paradox: strict eugenic selection reduces the breeding population. If only half the population of a generation breeds, they will need to have twice as many children to maintain or increase the population as if all reproduced. At 25% reproduction, 4x as many children will be needed per person or couple.
Perhaps lower people unsuited for reproduction but capable of supporting can be used to support well-chosen breeding pairs, with breeders given financial and asset gains to enable them to use the lower people, and technologies, to enable population growth while increasing the intelligence, morality and health of the new generations.