DeFeet socks are made in America. They suffered a terrible fire at their manufacturing facility a few year's ago, but continued to pay their employees, and rebuilt their facility in North Carolina. Unlike many clothing manufacturers, they are committed to producing their products here, rather than paying somebody in Asia 50 cents per hour.

I'm not sure where Sock Guy socks are manufactured.

I've used both, and like both although the DeFeet products generally seem to be a little better in terms of durability and construction.