明朝由盛转衰的历史事件中东北地区设立建州三卫又是何等重大一环
在永乐二年(1404年)，明朝在东北地区设立了建州卫，任命女真胡里改部首领阿哈出为指挥使。随后，又成立了建州左卫，猛哥帖木儿（爱新觉罗孟特穆）担任指挥使。在猛哥帖木儿去世后，由于其弟凡察与子董山之间的争斗，明朝于正统七年(1442年)将建州左卫分裂为建州右卫和左卫，让凡察掌管右卫，董山则控制左卫。这一系列事件 eventually led to the formation of the Build Three Guards, also known as the Build Tartar. Among them, Dongshan's left guard grew stronger and became the leader of the three guards. The growing power of Tartars prompted Ming to adopt policies aimed at dividing and limiting their territory, which only served to fuel resentment among various Tartar tribes.
Dongshan allied with the Western Tartars and launched attacks on Ming's towns in Liaodong, but this ultimately resulted in his death at the hands of Ming forces. This battle was recorded in history as "Chenghua Razing". The loss for Build Tartars was devastating. Dongshan is considered a direct ancestor of Nurhaci, who later unified various Tartar tribes and founded Later Jin (Nurhaci established Later Jin in 1616), becoming an enemy that would eventually bury Ming dynasty.
As Ming weakened over time, Build Tartars rose again under Nurhaci's leadership and finally united all tribes when he established Later Jin in 1616, marking him as an important figure responsible for undermining Ming dynasty.
