Final answer:
Confucianism, Daoism, and Legalism all primarily concerned with establishing a strong and centralized government.
Step-by-step explanation:
Confucianism, Daoism, and Legalism all had the main objective of establishing a strong and centralized government. Confucianism aimed to achieve social order and harmony through moral and social norms, emphasizing the role of authority and hierarchy. Daoism sought to find harmony with the natural way and rejected traditional morality, while Legalism focused on accumulating power and enforcing strict laws.