tribalism

 
Pronunciation: /ˈtrʌɪbəlɪz(ə)m/

noun

[mass noun]
  • the state or fact of being organized in a tribe or tribes.
  • chiefly derogatory the behaviour and attitudes that stem from strong loyalty to one’s own tribe or social group: a society motivated by cultural tribalism

Derivatives

tribalist

noun (chiefly derogatory)

tribalistic

Pronunciation: /-ˈlɪstɪk/
adjective (chiefly derogatory)