Which of the following best describes why most northern men joined the fight against the south?

many had a false impression that all southerners were evil because of their support for slavery.

there was a fear that if the south won, slavery would be expanded into all parts of the country.

they wanted to make southerners obey the constitution.

they were afraid of what might happen if the union were to dissolve.

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?