and here's the final tree,
conciliatory! a conciliatory government is also just as its name implies--one who seeks alliances and trade agreements through peaceful negotiation rather than underground fumbling or aggressive body language

- optimism will increase your nation's will to fight on even when they're losing during a war
- a national bank will drastically increase your trade efficiency and financial management
- civil service will ensure that even if your military is not conscription based, local farmers will join militia to fight off incoming threats
- a resilient state is a strong state. resilience, even in the face of utter annihilation, can very well win you a costly war. it reduces war exhaustion and inflation caused by war expenses
- adaptability grants the ability to change one idea when war is declared upon you. don't have enough manpower to fight a defensive war with your standing army? just change to mercenary army and start blitzkrieging!
- foreign embassies will grant a near-guaranteed neutral relation between two nations, ensuring a possible ally should the two of you find a common foe
- a defensive mentality is the key to winning, well, defensively. your forts gain a boost, making them harder to assault
- united front grants a passive movement bonus for military troops to all members of a defensive war. the more members, however, the less effective it is
- tolerance increases state-wide religious tolerance, lowering the risk of potential riots and revolts
- flexible negotiations guarantees the ability for the host nation, assuming they're the loser to a war, to receive at least one benefit from the peace
- supply trains increases the overall efficiency of supply routes crossing both land and sea
- experienced diplomats means that whenever you send a diplomat to form an alliance or propose a royal marriage etc, it'll most likely be well received