Many villages became small countries. As there were many countries, the power of those countries were not equal to each other. Therefore, strong countries became a baronial family and controlled small countries. Also, articles from burials showed that a disparity in wealth and status existed. It also implies that there was warfare among those small countries. After many people emigrated from China and Korea with their developed skills and knowledge, the food amount which was available for people became more stable and everything related to the culture developed during the Yayoi Period. However, people also started to have warfare among villages or countries during this period.

If you are ancient Japanese and live between Jomon and Yayoi time period, which period would you prefer? In the Yayoi Period, a developed country would frequently experience warfare but in the Jomon Period a small primitive village lived in harmony with happiness and no warfare.

One of the stronger countries was called Yamataikoku. Yamataikokuhe controlled about 30 smaller countries in 239 AD. Yamataikoku was under the rule of Queen Himiko, who was the first queen in the history of Japan. According to an historical document in China called "Gishiwajinden," the oldest historical records about ancient Japan, Himiko sent an ambassador to Wei in China and was given the title of Queen of "Wa." Japan was called "Wa" by the Chinese in the Yayoi Period. Yamataikoku thrived for approximately 60 years; however, there is no exact data for the area of Yamataikoku. Japanese archaeologist are struggling to find where Yamataikoku was.