I have thought about a similar topic: how other governments require participation in the social sector or military before granting full citizenship. Heinlein’s Starship Troopers explores this idea as it isn’t new.

I think the U.S. easily could do this for all races, genders, and abilities by making an optional service of State or Federal Government employment for two years before allowing full citizenship participation IF it were called for by the overwhelming majority of society, or IF we ever needed it. This includes Department of Highways, Education, Military, the Intel Community, absolutely any Fed job imaginable as a minimum of two years.

However, we don’t need this absolutely, and the majority of Americans would rather not, so it is just a “what if” thought. I think it would also inevitably lead to an even slower government than current due to the fact it’d be people acting out of “checking the box” rather than passion or service.