At precisely the three-hundred-year marker, Mormon makes a summary for that quarter of the whole four-hundred-year block. Both Nephites and Lamanites are so “exceedingly wicked” that they have become “one like unto another.” There is no reason to assume that the Lamanites have changed. Rather, the Nephites have adopted the surrounding Lamanite culture with its tempting economic and social trappings. True believers still live in the Nephite lands, but they are a minority among those who have either adopted pagan ways or syncretized their Christianity with paganism.
At this point, “Nephite” and “Lamanite” are difficult terms to understand. “Nephite” continues to describe people who should have been Christian, but it is more political than religious because most of the Nephites have apostatized from their true religion and adopted the ways of the world.
Chronology: Three hundred years in the Nephite count is A.D. 293.