Perhaps Naruto starts a war because he's been misled. He could be tricked into believing that another village is planning a massive attack on Konoha and all of its allies. In his haste to protect his home and friends, he launches a preemptive strike, which then spirals into a full - scale war as other villages retaliate.
Well, one possibility could be that Naruto is somehow influenced by a dark force. Maybe he discovers some dark secrets about the shinobi world that make him believe war is the only way to bring about true change. He might start by attacking the Five Great Nations, thinking he can overthrow the existing power structures and create a new, more just world.
In a fanfiction scenario where Naruto starts a war, it could be due to a personal vendetta against a certain group. For example, if a group of rogue ninjas were responsible for the death of someone he loved dearly, like Jiraiya. Naruto's anger and grief could drive him to wage war against all those associated with that group, regardless of the consequences for the larger shinobi world.
Chapter 387, "Hello everyone, this is my disciple", is the clearest early answer because a shaky connection becomes usable in the plot. A useful checkpoint is the way the scene starts with Liu Suqing V: "Even if we meet, I wouldn't recognize, faces covered...
Chapter 510, "The Fake Young Master", is the clearest early answer because it turns Shang Shaobai's situation into a concrete plot event. The chapter turns that into something concrete by moving from Ever since that night's family banquet, Gu Qiang hadn't slept soundly...
Chapter 532, "Little Lolita Beats Up Jungle Python?!", is the clearest early answer because it turns Zhou Xu's situation into a concrete plot event.
Chapter 563, "Quite the Confidence", is the clearest early answer because it turns Chen Manman's situation into a concrete plot event. It opens with Upon learning the result, the four of them stood frozen on the spot,...
Chapter 250, "This Jiang Li is Definitely Doing it On Purpose!!!", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event.
Chapter 429, "Is There Such a Good Thing?!", is the clearest early answer because it turns Team's situation into a concrete plot event.
Chapter 486, "So It's All Set Up, Right? Then She Will Set Up Too!", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Hearing Jiang Li's words, the audience in the live stream was also...
Chapter 833, "She’s Also a Quick Transmigrator?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with [It's the Yu Family and that Fengshui Family, the Li Family, who...
Chapter 587, "Has He Also Become a Part of the Play?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Zhao Lang said "thank you," but his eyes reluctantly glanced at Jiang...