I'd say almost all countries hold this view that what they do is justified by good intent, their higher moral values etc, whereas it doesn't apply to others. But it only becomes relevant if the country has actual power. The colonial Britain obviously had a lot of power so it's easy to find examples of "imperial delusions". The same is true for other countries today, or a union of countries. But the actual countries that are delusional change based on how much power they have at that time.