True or false Greek city states joined together to form the Delian league

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?

Which factor has played the most important role in changing the way history is studied over time?

At the beginning of wwii, what action by winston churchill influenced hitler’s strategy?