Final answer:
Band-level political organization is commonly found in gatherer-hunter societies, characterized by small, mobile groups without formal political structures.
Step-by-step explanation:
Band-level political organization is most often associated with a subsistence strategy of gathering and hunting. According to anthropologist Elman Service, bands represent the simplest form of social structure, characterized by small group sizes typically ideal for a nomadic or semi-nomadic lifestyle. These groups are often highly mobile, moving in seasonal cycles and relying on a direct application of human labor to environmental resources to sustain their way of life. Band societies do not have formal political structures and leadership is typically informal, based on kinship, age, or personal qualities rather than a centralized authority.