Analytical research of the excavations by historians and other experts resulted in the conclusion that there were two political forces at the end stage of the Yayoi Period; one central force was in the northern part of Kyushu, and another central force was in located in the southeastern part of the Nara Basin.
弥生時代末期には、発掘調査の結果から、北部九州を中心とする政治勢力と奈良盆地東南部を中心とする政治勢力が存在していたことが判っている。