Purpose: Recent trends in Western civics education have attempted to secure democratic institutions from perceived threats. This paper investigates how political securitisation historically operated within civics textbooks in Australia and Aotearoa, New Zealand. It further evaluates how Maori, Aboriginal and other Indigenous peoples were variably incorporated or marginalised in these educational discourses. Design/Methodology/Approach: This discourse analysis evaluates a sample of civics textbooks circulated in Australia and New Zealand between 1880 and 1920. These historical sources are interpreted through theories of decoloniality and securitisation. Findings: The sample of textbooks asserted to students that their self-governing colonies required the military protection of the British Empire against undemocratic "threats". They argued that self-governing colonies strengthened the empire by raising subjects who were loyal to British military interests and ideological values. The authors pedagogically encouraged a governmentality within students that was complementary to military, imperial and democratic service. The hypocritical denial of self-government for many Indigenous peoples was rationalised as a measure of "security" against "native rule" and imperial rivals. Originality/Value: Under a lens of securitisation, the discursive links between imperialism, military service and democratic diligence have not yet been examined in civics textbooks from the historical contexts of Australia and New Zealand. This investigation provides conceptual and pedagogical insights for contemporary civics education in both nations.