Why new technologies are making physical features less of a challenge when creating and changing national boundaries?

Ithink the answer to that would be b):

Since wxyz is 4, halfof that would be 2.

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

Answergovernment control over all imports and exports;