I'd say it's very hard for a powerful nation to not suppress somebody in the long run.
Just think of any powerful nation (or group of people, or whatever), and try to think of somebody they have oppressed, or are still oppressing. It's typically not hard to come up with examples.
Agreed. Its possible that the group survived their oppression and becomes powerful enough to oppress, they loose their identify, in the sense that their culture evolves, along the way. Resulting in oppression along some axis.
Just think of any powerful nation (or group of people, or whatever), and try to think of somebody they have oppressed, or are still oppressing. It's typically not hard to come up with examples.