Summary: For part two of our Introduction to Japanese History series, we'll be covering the Yayoi period which was a sharp change from the culture of the Jomon period, where there was a massive influx of NE Asians into the Japanese archipelago. This was followed by the Kofun period, where Japan began to slowly consolidate and unify into a confederacy. The name of the Kofun period comes from the huge keyhole shaped burial mounds known as "Kofun".