How did the us justify imperialism in Spanish american war?

Idon't really understand the question. it counts for 20% of my lesson grade and i really need putting the answer into words. anything will . i need asap so im awarding 30 points.a disagreement between states of the united states concerning the rights of states vs. the authority of the national government led to the civil war. state governments were forced by war into a subservient position. what might happen if national governments ceded their authority to a world government by international treaty?

Where were the trials to review evidence in cases against high-ranking nazi officials accused of war crimes held?

What were some of the most important native items adopted by europeans ? what impact did they have on european life ?