My plan is to slowly introduce you to technology a few decades ahead, and when my faction feels you are finally ready, they will offer you autonomous state status under them.

Basically means you I take control of your diplomacy and such, you have to allow their version of the bill of rights to be applied to your citizens, and your military will serve under mines but you retain most internal governance and you are protected by my military and usually get vast amounts of resources to assist with your projects.