Treading Water with 'Stan'

Can nobody help me with this lone struggle against obtuseness? We now have the response from 'Stan' (who is not limited to any maximum number of words) and it is this, almost wholly unresponsive item, apparently written by someone who hasn't read most of what I have written.

I will take it piece by piece.

'Stan': 'You claim that the British guarantee to Poland changed history is "blindingly obvious" without any way to substantiate this claim. How do you "know" it changed history? How do you...