Start with a 500-year Inter-World War. Continue through ecological disaster and the decimation of populations. Follow the institution of a Worlds' government that helps bring a glimmer of hope. Discover the challenges and failures of unifying three very different Worlds. Explore what it takes to give birth to a lasting peace. This is what reading Notes from An Alien promises. And, this story could help Earth...
"A peace is of the nature of a conquest; for then both parties nobly are subdued, and neither party loser."