"I’ve come to an uneasy acceptance of the fact that we’re all the conquerors and the conquered."
We all have to accept the past. We don't need to accept that the future will be the same.
There are many ways that different areas and cultures can share an assimilate. Trade, travel, multilingualism, federations, mutually-agreed democratic annexation, shared constitutions, diplomacy, immigration, intermarriage, etc.
Coercion is not the only option.