Bald Eagle. Yes furniture made with green wood does warp. That is the point of making it with green wood. The furniture was made in such a way, that the stress caused by warping caused in each joint to pulled against others to hold the furniture together without using glue.A couple of points worth noting. The wood was split along the grain, not sawn, as it is today. We now keep our homes warmer and use central heating. It causes a much drier atmosphere and consequently dries and shrinks the wood more. Furniture made the old way wouldn't last so well now.
If you ever visit High Wycombe, go to the Furniture Museum, it is small, but worth the visit.
I was born and raised there, and some of my family worked in the industry. So, I have gained a little knowledge on the subject, but not much.
Brian