A conflict in the State of Kansas where pro and anti slave groups were killing each other was called
bleeding Kansas
Kansas - Nebraska Act
The Civil War
O the slave act

This was an order issued during the civil war by president lincoln ending slavery in the confederate states

4. any area in which one nation has power over another; i.e. - this happened to china when it was defeated by japan

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?