I'm playing as Portugal, the year is 1885, and I'm at war with Oman. I have occupied all of their provinces but when I try to annex them, it says 'They would not accept this offer'.
Here's 3 screenshots:
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Warscore is 92 and conquest is a wargoal. Maybe it is because they are allied with Bukkhara? I signed a peace treaty with them. Thoughts?