Most humans already practice eugenics naturally. Any anthropologist worthy of the name will tell you this. Hardly anyone selects their mates based purely on personality.

Many black folks (for example) might have chosen lighter skin (and some might do so today) to protect their child from racism.

This works both ways. A ton of suburban pimple-faced wannabe whiteys would do damn near anything to be darker.

And in a way it's happening. White females and black males are intermarrying more than ever. Each group is trying to add the traits of the other to their offspring...which is good actually. Hybridization is the exact opposite of inbreeding, cf. heterosis (http://en.wikipedia.org/wiki/Heterosis). Same thing with white males and asian females like my wife and I. My daughter is doing excellently.

I find this depressing and my instinct is to find a way to prevent it.

Why? It's already happening naturally. And it's a good thing.

But, should the state have any place in such choices?

No, fuck the state. The first thing they'd have to do is outlaw intermarriage to prevent the darkening or lightening of a potential child's skin. I oppose this.

Also, is your husband white? If so, you are already a busted condom away from practicing eugenics.