The Fourth Great War of Mine generated irreversible impacts to the WorldDrastic changes occurred in the place to which the war extended
The summoning of Juubi, the Progenitor of Chakra led to a Cataclysm in the World just by raising the Beast Chakra
Millions of people lost their lives in this bloody battle and among them one of the people that Naruto liked the most, Neji Hyuuga
Only two people caused this rampant massacre
Madara Uchiha, the Phantom of the Uchihas.
Many believed he was dead and actually died after a while, but he was revived although not in the way he wanted but he was brought back to life with a Kinjutsu
Madara held an immense grudge. Well, that's what it looked like. However, what he really wanted was to bring peace to the world and for that war would be necessary.
Now the other one, Obito Uchiha, one of the participants in the Uchiha Clan Massacre and the one who kept a certain resentment of Kakashi for having killed Rin
The one who impersonated Madara to manipulate the entire Akatsuki, in addition to having given the Rinnegan to Nagato who, through his speech on Naruto's Jutsu, was convinced that wars would only cause more unnecessary deaths
It was a practically one-sided war, since they couldn't hurt Madara or Obito.
They summoned Juubi, the Ten-Tails
Obito was the first human to become the Ten-Tails' jinchūriki.
However, he passed this post to Madara who was betrayed at the end when he was going to receive the second Rinnegan by Obito himself.
But even so, Madara still got his other Rinnegan, thus completing his precious plan which he elaborated for hundreds of years by putting everyone in the Infinite Tsukuyomi.
However, Madara was betrayed and that's when he discovered that he was actually being manipulated by Black Zetsu who wanted to revive Kaguya.
In the battle, Naruto and Sasuke, the two reincarnations of Indra and Asura were on the verge of death, unable to fight but the Hagoromo ōtsutsuki appeared and gave them the necessary power to face Kaguya
Sasuke and everyone that Naruto liked and held in high regard died in battle. Sasuke died before they could seal Kaguya thus sending the world into utter despair.
Seeing this, the Sage of the Six Paths had to spend all his power so that Naruto could seal the Juubi in his body and thus stop the Great War, as he knew that Naruto's body would not resist the Juubi's power.
With that, Hagoromo died and Naruto became the New Sage of Six Paths.
Since he was the Juubi's new wielder, he could become the target of elimination or who, by mistake, released the Tailed Beast to the world.
Naruto then sealed himself in a different dimension so that he wouldn't affect the World too much, as he would become a possible power of war and destruction.
In order to contain the Juubi perfectly, Naruto was forced to train even more and more, which made him reach the Level of a God
And even more so with the Ten-Tails Chakra running through your veins
However, before training, Naruto had to meditate to permanently remove all the impurities that were in his body.
With the Ten-Tails Chakra, Naruto awakened the Rinnegan and Sharingan that would later become the Six Eyes.