In this unit, you studied world war i and world war ii. both of these wars had devastating effects on the nations that were involved in the war. what were some of the peacekeeping measures that were taken after each conflict to prevent future wars? how successful were these measures? do you think another world war could ever take place again? why or why not?

Several of these questions are opinion, so I can't really help with those, but I can answer the first one.

After World War I, the League of Nations was created to try to help keep the peace and solve problems between nations. The same went for the United Nations after World War II. There were also the treaties that ended the wars. (You'll have to decide whether or not these were actually successful.)

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

after the roman empire, the catholic church began to unify by taking on many duties of a government.