After the Zhou became the ruling dynasty, they mostly appointed their own officials. The Zhou Dynasty had its own way of assigning its officials. However, in order to appease some of the citizens, they allowed some Shang beneficiaries to continue governing their small kingdoms in compliance with Zhou rules and regulations. As the empire continued to expand, intermarriage increased because the rulers believed that it was a method of forming strong alliances that enabled them to absorb more countries into the dynasty. In the case of a war, the Zhou dynasty boasted excellent military and technology mostly because of influence from annexed countries. They also excelled in shipbuilding, which, coupled with their discovery of celestial navigation, made them excellent mariners. Intellectually, the Zhou excelled in fields of literature and philosophy while many governmental positions were filled according to the intellectual ability of a candidate. A large amount of literature survives from the Zhou period, including the "Book of Changes", "Book of History", "Book of Etiquette", "Book of Song", "Book of Odes", and the "Book of Rites". Most of these works are commentaries on the progress and political movement of the dynasty. In philosophical terms, Confucius and his followers played an important role in shaping the mentality of the government as defined by the Five Confucian Relationships. These critical thinkers served as a foundation for the government. Their works primarily stressed the importance of the ruling class, respect, and their relationship with the lower class. Due to the growing size of the dynasty, it became apparent that a centralized government would lead to a lot of confusion and corruption because the government would not be able to exert its influence or accede to the needs of everyone. To address this political barrier, the dynasty formed a decentralized government in which the empire was broken down into sections. Within these districts were administrators who were appointed by the government, in return, they had to maintain their allegiance to the main internal government. In effect, the Zhou dynasty became a collection of districts. Consequently, this marked the fall of the dynasty as it became difficult for the central government to exert influence on all other regions of the empire.