It has yet to be shown that any Western men will do what is necessary to seize and hold a homeland outside of Europe, North and South America, and Australia.
It is not even clear that we are willing to fight for Europe.
Your advice to the Boers is easy to give. It may not be so easy for them to follow.
It won't be easy with other Western men siding against them. The US and Europe forced them to give up their power.