Final answer:
Chiefdoms are sociopolitical systems without rigid socioeconomic stratification but with inequalities based on kinship ties and proximity to a central leader.
Step-by-step explanation:
Among the different types of sociopolitical systems, chiefdoms lack socioeconomic stratification and stratum endogamy, but they do have inequality and a permanent political structure. Chiefdoms are characterized by a centralized leadership with a chief at its head. These societies have unequal access to resources and status, but unlike caste or class systems, they do not have rigid socioeconomic stratification nor do they enforce stratum endogamy; however, inequalities exist based on kinship ties and proximity to the central leader. The evolution of sociopolitical systems from bands, to tribes, to chiefdoms, and ultimately to states showcases how different levels of organization and centralization of power can impact the stratification within a society.