If you are ok with a small amount of synthetic for stretch, we have a local to MN company called Hippy Feet with majority cotton socks (in addition to wool) that are made in the US.

They also give 50% of their profit to nonprofits that support homeless kids, which is cool. However they don’t have a lifetime warranty.

The only other one I know about is farm to feet, which are all wool (from/made in us), but they do the the lifetime guarantee.