So what is the story behind this? Is it just the frustrated colonization attempt?
Just a very badly concluded negotiation to keep the balance between "I found a colony with how many people I want" and "if you bring away 40% of Morek we are not going to be on friendly terms with your colony". Allison accused busto of not respecting the freedom of the duchies and asked he to step down. He didn't and she seceded.
War is quite likely