I'm playing as the Creek nation in North America with the Cherokee as a vassal. My mission is to absorb the Cherokee into my country. A few years ago, I integrated the Choctaw without issue, but the dialogue box for annexing the Cherokee says:
Annexation is estimated to be done Unknown due to 3 basetax.
This message continues for a few months, so I stopped trying the diplomatic annexation. I sent another diplomat to Improve Relation with them, but even after boosting it to the limit, there's no estimate of when the annexation will be done. Here's the tooltip:
Is this a bug or is there something I can do to annex the Cherokee peacefully?