Title says it all.
Also, what are good ways to increase your monthly income. I'm doing a get-to-no-the-game playthrough as Rome and monthly income is either like +10-20 or negative the same so I go between sparing cities and looting them and would be to able to be more consistent about that.
You can directly improve Province Loyalty by,
- Using "Harsh Treatment" governor policy. - Building Court of Law.
- Building Temples and Theatres.
- Appointing governor with high finesse and low corruption.
- Certain national ideas and tech.
- "Government Traditions" great wonder effect.
- Placing levies from your capital, with ruler in charge, on the province capital and using "Anabasis" ability.
- Importing trade goods into the province which increases pop happiness, although it may not be a significantly large effect.
Indirectly, Province Loyalty is affected by population happiness in the particular province, so you'll notice province loyalty getting worse when you have negative stability, high war exhaustion and very high aggressive expansion, so pay attention to those and try to min/max them. At the same time, pop happiness is also connected to the status of the culture and religion in that province, so assimilation of pop to your primary culture and also conversion to your religion will slowly decay unrest as wrong culture / religion penalties reduce. Check whether you wish / plan to accept the culture in that province as integrated or not because integration will increase pop happiness of that culture greatly, otherwise you should try to speed up the process of cultural assimilation.
You can speed up cultural assimilation and religious conversions by,
- Using governor policies.
- Building Temple and Theatre to get the flat increase in rate, then supporting them by building libraries and marketplaces to add the % bonus.
- Certain tech and ideas.
- Effects of some dieties.
- "Expanding Culture" great wonder effect.
- Adopting certain laws if available.
- Building Road networks to adjacent territories / cities.
It's better to convert religion first before you assimilate because it's easier / quicker to assimilate same-religion pops, so focus on conversion first. Also remember that each diety in your state pantheon which is from a religion other than your primary religion, will add a pop conversion penalty to your nation.
That's all I could think of off the top of my head. Hope this helps.