The AI in Attila doesn't make sense. They'll raze a settlement in their own province instead of capturing it and then go over three provinces and capture a settlement there. They do not build kingdoms but instead prefer razing and sacking.
Full Answer
What happens if you exclude a province from taxes?
If a province gives you five thousand coins each turn, and you're profit equals eight thousand, then excluding it from taxes will take away most of your profits and thus will slower growth of other provinces. Additionally, one large war or crisis will be enough to change profits into loses. But if profits from a province are 500 per turn and the whole country earns ten thousand, then the treasury won't feel drastic change after excluding province.
When to exclude province from tax system?
First - when you're unable to give it enough food, from import or local production. When shortage is a level 50 and more it is a good moment for that, if shortage is at level 100 and more it means the province is in catastrophic state.
How to solve corruption?
First, by excluding a province from paying taxes, which is completely pointless in long term. Excluding a province doesn't lower the corruption, just limits it to zero, which with the lack of profits doesn't matter anyway .
What increases squalor?
Sewers, wells and other sanitation buildings increase sanitation level. Expansion of cities and workshops increase squalor level. As long as both indicators are on same level, you don't have to worry. If squalor starts to be higher than sanitation, then there is a chance for disease to occur in the settlement. Usually the chance is from 1 to 3 %, in extreme situations 5%.
Can a province be excluded from paying taxes?
Although the taxes level is set for whole country, it is possible to exclude some provinces from paying. Excluding a province from paying taxes reduces the corruption and immigrants to zero, gives none profit and excludes a province from nation feeding system. A province stops producing food for the rest of the country, no longer exports or imports it.
Does excluding provinces from paying taxes improve public order?
As one could guess, excluding province from paying taxes improves public order. Specifically, it removes the negative impact of taxes on order, but not increases it. There is no no taxes condition that gives bonus to the order. If a province had too little food, its negative impact will worn off a turn after excluding it from taxes.
