So here are more or less my ideas for Foreign Affairs civics:
Isolationism (Starting Civic, no Tech requirement)
No Upkeep
Appeasement (Available at Currency)
Low Upkeep
Pay 5% of
as tribute to most powerful civilizations
+2 relations with most powerful civilizations
Imperium (Available at Feudalism)
Low Upkeep
Seizes 50% of foreign connectedness profits with your cities from civilizations weaker than yourself
+33%
from foreign connectedness yield
-4 relations with civilizations weaker than yourself
Protectionism (Available at Mercantilism)
Low Upkeep
No Foreign Trade
+33%
from domestic connectedness yield
-2 relations with all civilizations
Interventionism (Available at Political Philosophy)
High Upkeep
-50% War Weariness
+1 relations with other interventionist civilizations
-1 relations with isolationist and protectionist civilizations
Civilizations can not cease relations with you
Civilizations at war more likely to allow diplomacy
+25%
from foreign connectedness yield
Redevelopment (Available at Social Contract)
Medium Upkeep
Pay 5% of
to weakest civilizations
+2 relations with the weakest civilizations
Forces "Rite of Passage" agreement with weakest civilizations
Yes, now you can be a jerk with your civic choices. To be clear about the Pay 5% of
options, you pay 5% of your gross
income, and that 5% is split amongst the eligible civilizations, it is not 5% each.