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If a district makes a tavern and has people petition for citizenship is it up to that district, the Founders district, or a council of districts? Also, will they be considered as migrants or district citizens?
After weighing the pros and cons, I'm going to say that the District who has the highest ranking Noble as a member will get to approve citizenship requests, and if granted, the new citizen will become a member of any District willing to pay the "application fee", or become a "free range" migrant if no District wants them.
This is how I see this happening:
1. Visitor applies for citizenship at some Inn
2. Game update file posted to the forum along with an announcement of the application
3. Player whose District was applied in takes a look at the applicant in the updated save game (while anyone who wishes to does also by uploading the save file.)
4. Player decides whether or not to sell that application to the District containing the next higher Noble than is in their District (Mayor->Baron->Count->Duke->ect...)
5. Player attempts to sell the application to the Player with the next higher Noble.
6. If sale is accepted, but that Noble is not the highest one in the City, the cycle repeats from step 4. However, if the person who bought the application is the highest ranking Noble in the City, then they decide whether to grant the request or not.
7. The Player who granted citizenship then can decide to auction off the membership of the new citizen to other Districts in order to attempt to recoup their investment, or they can decide to just eat the price and have the new citizen become a member of their District instead.
8. If offered for auction, the price of the new citizen's "application fee" must be met or exceeded. Otherwise, the citizen is deemed not worth their fee, and they become "free range" instead. (Making the granting of the request a bit of a gamble.)