How can a position against colonialism be critical of the dominant order as a whole?

Question

I'm attempting to understand how one can propose "decolonize" as a position that also challenges the dominant order.  If I decolonize, what would that mean?

This is related to "Occupy" and "Commune".

Comments

How did the dominant order become dominant? How did it get here? How did it establish itself?

Although it's not the most specific language, and just like anti-imperialism may be easily taken up by nationalists, decolonization could easily be seen as critical of the dominant order as a whole.