Re: How do you destroy a faction in ETW?
Hi olep, it sounds like a rebellion occurred in a region in which the United States was emergent. If the rebellion captures the capital, then the nation emerges (or re-emerges).
If you'd like to prevent this from happening, you would simply need to change which faction is emergent in each region where the US is currently emergent. I explained how to change which faction is emergent in a region in this post. (Don't forget to look in the Empire Mod Workshop when you have questions about modding! You can ask questions about modding there, if you can't find the answer).