Go to the link provided for A global guide to the first world war. Scroll down a little until you see the big yellow circle, click enter, once you have entered go to the bottom of the screen where the number bar is, go to part 2 trenches, view it and write a summary and reaction. Do the same for part 3, Empires and part 7, Aftermath. Write you reactions to all three here. Clearly label them. The first paragraph should include your introduction.

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?