Jarom turns from the stiffnecked people who were likely his focus for preaching to what appears to be the majority of Nephites. On the whole, Nephite society at this point is one founded upon and ruled by the Mosaic law, augmented by the Christ/Messiah teachings of their prophets. Jarom highlights the general righteousness because he sees that as a direct fulfillment of the prophesies that they will remain on the land in accordance with their righteousness.
Historical: Two hundred years for the time we are using for the departure of Lehi from Jerusalem (January of 586 BC) places this next dated event at 386 BC.