Alexander the Great followed the customs of the lands from the former Persian Empire. This gave great stability to his vast empire and got hi, into good graces with the local towns and people’s.
All of these are defensible. Of course debt rises in war, and decreasing taxes will benefit an economy where taxes are no longer needed (post-scarcity.) Political and geographical boundaries are outmoded and a world without them is not only possible but existed for much of early human civilization. As for the government, a government would run more efficiently when everyone is in basic agreement with what to do and how.
I would question your teacher on this. Anyone can defend these perspectives...
Sparta I believe... they trained young boys for the military.
