The faith of the Lamanites becomes such that they become overall more righteous than the Nephites.
Many Nephites abandon their faith, yet the church continues to grow because of the continuous flow of Lamanite converts.
Righteous Lamanites migrate into Nephite lands, and testify of their conversions to the Lord, exhorting the Nephites to repent.
Nephi and Lehi go to the northern lands to preach.
Nephi and Lehi in Prison
Nephite and Lamanite Intermixing