How do leaders justify wars to their people and to the international community?

A war is only just if it is fought for a reason that is justified, and that carries sufficient moral weight. The country that wishes to use military force must demonstrate that there is a just cause to do so. ... Sometimes a war fought to prevent a wrong from happening may be considered a just war.

i would say your answer would be the second option.

hope this !

d) the constitution rights of native americans and their right to self-government on reservations