If you grow a tail, you will be a human with a tail. You also wouldn’t be able to sit down as a chair assumes you don’t have a tail. I think cutting a hole in the chair would be uncomfortable for everyone else who is sitting in the chair.
The middle of the chair is where your asshole is, not the base of your spine. Back of the chair hole would be perfectly fine. Alternatively, sit in a soft enough chair that there is not too much pressure on your tail.
That would be the equivalent of gradually getting America to not eat meat.
What I support is requiring companies that produce meat to go from 100% meat in their meat products to 99.5% meat, .5% plant protein. Increase the plant proportion by .5% every year so in 200 years, society isn’t killing animals for food anymore. Encourage anyone that wants to eat eggs to get their own chickens so they raise them in a more humane way than companies. There would also be less ticks.