Why was the title of Song State so high in the Zhou Dynasty, and which vassal state was made a duke?

Song people were mainly Shang immigrants. Based on the principle of respect, the title of Song State is still very high.

Guo Wei and Zheng Guo were vassals in the bonfire drama in Wang You, who helped Ping Wangdong move, so their titles were also very high.

Lu is a descendant of the Duke of Zhou and has a close relationship with the royal family.

Other countries include Jin Hou, Qi Hou, Qin Bo, Chu Wang, Chen Hou and so on.