Gary, I've been an electronics designer for 20+ years and I'm not aware of any socially responsible distributors of components. In fact there's a growing problem with fake components, but let's keep to the subject in hand.
The problem being, as someone else indicated, that say you are DigiKey or another distributor. You may stock tens of thousands of lines, and the profit on each component does not support rigorous auditing, and no one asks for environmentally sound components because if your product is more expensive than that thing made in China, it won't sell.
Also, the "manufacturers" sometimes shift things to other fabs so a chip may *start* its life in California but as those fabs shift to smaller geometries, the older tech stuff gets transferred to the Philippines or wherever. I've seen PCB's with several chips, all ostensibly the same device (and all working), but with different factory markings on them. Sometimes common chips are even made by different manufacturers.
I've fretted over this issue considerably, and my own conclusion is, better to assemble in Europe or America (where workers are treated relatively well) but, don't try to control the source of the chips. I comfort myself by thinking, each chip probably contributes a fairly small amount towards pollution. Also, as the poorer countries industrialise and their incomes climb, they become more interested in the environment and become self-policing - a long view, but you're not going to change them.
I suspect there *is* one industry which uses traceable components from known sources: the defence industry. Generals don't like to be dependent on 3rd world countries for their supplies. I don't know much about that side of electronics supply though.
Finally, it is an unfortunate fact that this newsgroup has a high population of flamers, and even some of the very helpful types seem able to bring right wing politics into every post, perhaps it is a sort of peer bonding thing. Your post here was like raw meat to a troll. Fortunately, the newsgroup has plenty of people who offer salient advice. Why, it was here that I learnt that resistors are much tastier after frying.
I feel I ought to finish this with some biting sarcasm so as to retain some credibility amongst the jovial roughnecks who populate this group, but it would be like clubbing a baby seal.**