There is absolutely a chance for a peaceful approach. But it requires quite abit of luck with: Spoiler : 1. Monty founding Buddhism/Hinduism. 2. You getting spread fast enough (Difficult with lack of connecting rivers and coastal cities). 3. You succeeding in producing 2 surplus settlers fast enough, and managing to escort them through the jungle and gaining +3 liberation bonus. Then you will get to friendly, and be safe long term. But what next...?