げこくじょう Briefly explain this event in the Warring States period of Japan?

The Warring States period of Japan is known as the era of "Shimokeshi" (下克上). The term "下克上" refers to the replacement of superiors by inferiors, the usurpation of the main house by a separate house, the destruction of the head of the house by a vassal, and the expulsion of the samurai by peasants....... The greatest sources of daimyo in the Warring States period were in fact the kokusai (国人) and the tutelary generation.

Main events:

1, Yingren's Rebellion, the warlords debut

2, Ming Ying's change, the Kanto chaos

3, below the top, the shogun was regicide

4, the hegemony of the rise of the shogunate's demise

5, Azuchi-Momoyama, the second attack on the Joseon

6, the Sekigahara War of the Joint War, the Genkaku and lay down the sword

Summary: After the rebellion of Yingren, the shogunate's prestige declined, and its ability to control the country's daimyo was gradually destroyed, and was finally destroyed by the expulsion of Oda Nobunaga. Some of the original guardian daimyo were challenged by their own people's national premier riots (e.g., the Angei Takeda Clan was replaced by the Mouri Clan's national premier), and some were replaced by the guardian generation underneath them (e.g., the three kingdoms of Echizen, Tonoe, and Owari, which were guarded by the Sporthi Clan, were controlled by the Asakura Clan, the Kofi Clan, and the Oda Clan in that order), and some were even overthrown by the religiously based Iyi Kyu (e.g., Kaga guardian Fukien Clan was completely annihilated by the Iyi Kyu). Some were even overthrown by religious ichi-kuei (e.g., the Kaga tutelary Togashi clan was completely eliminated by ichi-kuei). The culture of "downward mobility" pervaded the entire Japanese Warring States period, and became the most distinctive feature of this era.