Final answer:
The unity of religion and government in traditional Japan was expressed by the term State Shintoism.
Step-by-step explanation:
In traditional Japan, the unity of religion and government was expressed by the term State Shintoism. State Shintoism refers to the incorporation of Shinto beliefs and rituals into the government structure, with the emperor considered a divine figure and the head of both the religious and political spheres.
During the Edo period in Japan, the government enforced strict codes of conduct, including the ban on European Christian religions and the promotion of Buddhism and Shintoism as the prevailing religions. However, a parallel system developed with Buddhism and Shintoism coexisting.
It's important to note that the unity of religion and government in traditional Japan was not unique to Shintoism, as Buddhism also played a significant role in shaping the cultural and political landscape of the country.