Use your map skills and mathematical thinking skills to determine the question every pioneer asked, “How long will this journey take?” Assuming pioneers traveled 15 miles per day and rested one day each week on Sunday, about how long did it take them to complete the Oregon Trail from Independence, MO to Oregon City, OR?

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?