Treaty of Higurashi

The Treaty of Higurashi (条約の蜩, Higurashi no Jōyaku; "Treaty of the Evening Cicada") is a "treaty of alliance" (同盟条約, dōmejōyaku) between the Land of Mountains and the which was signed at Higurashi Shrine in the Land of Mountains. It took eight days to debate and finalize the treaty.

The Treaty
The treaty of Higurashi took place two years after Seireitou Hyūga's botched Peace Requiem plan. The Kage from each nation formally agreed to accept the Land of Mountains as having equal status as their nations; allowing the Land's village, Yamagakure, to become an official part of the villages that make up the newly dubbed Great Shinobi Countries, as well as allowing their leader to have the official title of Kage (though the villagers used the title long before this anyways).

This, however, did not come without terms. Yamagakure was supposed to be a neutral nation, meaning that its past alliances with other nations were dissolved in favor of making it and the Land of Mountains a "safe zone" for shinobi of all nations. Fear arose from the Yamakage, then Ryun Uchiha, that the nations would use their to intimidate Yamagakure to doing their bidding, despite the "no-alliance" rule. As a solution to this, the Kage determined that the remaining tailed beasts - Gyūki, the Eight-Tails, and Kurama, the Nine-Tails - would be handed over to Yamagakure to be sealed within new jinchūriki there.

The treaty also recognized the Uchiha Clan as a Yamagakure clan now, as its new leader, Ryun, who had restored the clan, was the leader of Yamagakure. '

Trivia

 * The treaty has, thus far, not been mentioned in Enken by name.