Post-Colonialism and New Identities

What does the discourse of postcolonialism mean for the people of races “created” as a by-product of colonialism?

Pakeha is a recognition of the unique blend of New Zealand Europeans and brings them in connection to Maori. It is a ramification of the Treaty of Waitangi when the partnership of British colonial powers were supposed to be cemented. Similarly, Fijian-Indian was a by-product of colonists exercising their power to bring Indian indentured labourers to Fiji, thus forming a unique cultural identity.

When people feel their race is being undermined, collective strength is important in strengthening their identity. What is interesting about this identity politics for the postcolonial races is that, in order to amplify the voice of your unique cultural identity, is indeed to recognise and support the colonial past.

This makes me wonder whether decolonisation is even possible. One may need to undo the social constructions in place which made postcolonial identities what it is. For those relating to the “in-between”, what sense of belonging may they then retain?