What did it take to make an Amendment or change the Articles of Confederation?

The quote below is an excerpt from the charter of the united nations: "the purposes of the united nations are: to maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace . " source:this section implies that the united nations is prepared to do what to keep world peace?

How does wards description of the roman government compare to polybius description in sorce 1 and millars description in source 2

The car market is an example of because it has few sellers who offer differentiated products. a.oligopoly b.monopoly c.monopolistic competition