Since the Demon Race's invasion, every Shinobi Village had come to understand its own shortcomings through the war. Even Konoha, the strongest of them all, had suffered devastating losses. Before leaving for the Azure Continent, Naruto had shared his ideas with Tsunade and the Third Hokage: unite the villages, form the Allied Shinobi Forces, and establish a Shinobi World Federation that brought every village together, much like the United Nations in his previous life.
Naruto also drew on the business knowledge he had learned in his previous life to build infrastructure and promote development, turning the nations into a community of shared interests. This greatly eased the tensions between them and deepened their mutual understanding. Their shared interests also made wars between the nations quietly disappear.
After settling the Shinobi World's internal problems, Naruto had discussed its development with the Kage of the various villages. Fortunately, he had some rapport with all of them. The Kage of the Five Great Nations had each expressed their willingness to take a gamble with him, as long as he could find a way to address their villages' development. After all, none of them wanted war.
Naruto understood this all too well. Over its history, the Shinobi World had endured the Three Great Shinobi World Wars, and ultimately, they had all been conflicts over interests. The Shinobi World was only so large, with only so many resources. Development required expansion, which had led to those three wars. But now Naruto had found a new solution, and the nations' Kage were naturally eager to try it.
When Naruto and the others seized the Bloodkill Principality on the Azure Continent and established a massive Teleportation Array, Tsunade immediately began making preparations. She invited the nations' Daimyo and the villages' Kage to Konoha to discuss the Shinobi