Which of the following geographic features made a trade with Arabia challenging for the Mali Empire during the Medieval period?

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?

An alliance of two political parties is know as? a. majority b. coalition c. candidate d. government

How was george washington able to defeat the british in the battle of trenton and princeton