Final answer:
The Yamato had the right to rule the Japanese people due to their display of power, control over burial rituals, issuance of law codes, and reliance on Chinese culture.
Step-by-step explanation:
The Yamato most likely believed they had the right to rule the Japanese people due to several factors. First, the Yamato rulers demonstrated their power and wealth through the construction of large keyhole-style tombs and control over burial rituals. They also created capital cities with large markets and highways, showcasing their organizational capacity. To centralize power, the Yamato kings issued law codes, such as Prince Shotoku's Seventeen Article Constitution, which emphasized law as the basis for rule. The Yamato rulers also relied on Chinese culture, mythology, and bejeweled regalia to elevate themselves to godlike status and transform into emperors. Later legal codes, such as the Kiyomihara Codes, further organized the political system in Japan.