How are federal judges selected?

candidates are nominated by current federal judges and appointed by congress if the house approves by a two-thirds majority vote.

candidates are nominated by congress and voted upon by citizens over the age of 18 in federal elections.

candidates are nominated and appointed by the supreme court unless the president uses the veto.

candidates are nominated and appointed by the president if the senate approves by a majority vote.

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?