Changes to Integration: Nobles vs Citizens
As described in previous diaries in Menander any culture which has at least citizen rights is considered integrated. Integrated cultures will use the same happiness modifiers as your primary country culture and be immune to assimilation.
Each additional integrated culture also reduces the happiness of all other integrated cultures, as well as your primary culture by 5%.
To further differentiate Nobles and Citizens, which are both civic right statuses that count as giving integrated, there is now an additional penalty of 5% for each culture that is given noble rights. Meaning that every culture granted noble rights will dilute the happiness of all cultures even further than those given Citizen rights. Think carefully about who you ennoble!
All countries that start with integrated cultures now have these at citizen rights, with only their primary culture granted rights of Nobility.
Last but not least, there are now things that affect how long it takes to integrate cultures, beyond how many pops they have.
Each cultural right you have granted a culture will make it quicker to integrate, thereby reducing the stability you will lose in the process.
It also now takes 50% longer to integrate a culture from another culture group, making it costlier to integrate cultures that are more distant from yours.