Who makes decisions to manage or regulate conflict in our society? How are those "decision-makers" selected and by
whom?

The correct answer to this open question is the following.

Who makes decisions to manage or regulate conflict in our society?

The federal government, the state government, the United States Congress with its two chambers(the House of Representatives and the Senate), and the judicial branch with all of its courts.

How are those "decision-makers" selected and by whom

United States citizens have the right to select the President of the United States and their representatives at the federal and state levels.  That is why they vote.

The leader of the United States is the President, who also is the chief of the executive branch and its cabinet. He is the most important decision-maker. At the state level, it is the governor. However, the US Congress and the state's congress also play a key roll in creating legislation.  

answer; i believe that the correct answer is (d); //declaration of independence; plz check first good luck

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.