The extermination of original inhabitants in conquered territories was only partial, there was a large degree of assimilation as well.  In spite of the Norman-French invasion ("1066 and All That"), strong traces of Anglo Saxon speech are still to be found in North English dialects.  Today, a great many Britishers hold the Germans in higher regard than the French, two recent major wars notwithstanding.
The non-extermination of local tribes is a point that makes SA different from the corresponding situations in many other colonial areas: North America and Australia, for instance