Advance
Adaptability
There is what is ours, and what is part of our ancestral domain that will never be surrendered. A bit of flexibility in defining these 'ancestral' borders will lead to more land being accepted as our rightful territory, and should the worst happen, the whole world will know our crusade to recover it will be just.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
Modifiers
Definitionin_game/common/advances/4_choices_mil.txt:188
190icon = diplomatic_range_age_1
191for = mil