Studies of universals of culture identify hundreds of human behaviours, features, and patterns of interactions, which can be found in any culture. The present article aims to identify and describe a small number of key universals, which are only necessary for a culture to emerge but for its progressive development as well. The theory of culture as an aggression control system is put forth identifying three such universals. First, to enhance cooperation, all cultures require impulse control of their members. The most important impulse to control is aggression. Second, all cultures have social structures to exercise such impulse control. Third, effective control of ingroup aggression is an important resource for development of a cultural group, providing some cultural groups advantage over others. While the path towards reduction of physical ingroup aggression seems clear, certain challenges remain, such as balancing different aspects of security, control of non-physical aggression, and intergroup aggression.