In 3 Nephi 7, the government that has been in effect since the time of Mosiah shuts down, as the chief judge is murdered once again and the Nephite people split up into various separate communities (or tribes), each with its own laws. Each tribe considers itself an entity unto itself — all other tribes are enemies — and nobody is willing to take direction from anyone else.
Nephi, perhaps assisted by his brother Timothy, goes among the people to preach repentance and faith in Christ to them. Miracles are performed so the people can witness the power of Christ. Yet, they are unmoved and, in fact, become very angry. They even take Timothy and stone him to death! Nephi responds by raising his brother from the dead!!
Now, it would be a nice ending to say that the people were converted after witnessing such an obvious display of the power of God — someone being raised from the dead. However, that's not what happens. Other than a few who are converted, the people continue down the evil path that leads to their eventual destruction in the next chapter. Sad to see people so enslaved by the enemy that even witnessing the raising of the dead can't free them.