To see the Voortrekker monument in Pretoria is to recognize at once that it was built to humble the observer. With walls as thick as parts of the Maginot Line, and ambushments that would do credit to a medieval fortress, this South African national museum would serve equally as well as a defensive outpost. What mentality would create such an imposing structure? We can find the same outlook half a world away in the fortified homesteads that Ulster-Scots...