Why has it been difficult to travel by land in greece?

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?

3. what was the government’s target population (goal) for 2000?

Who issued the ruling for the supreme court? dred scott roger b. taney abraham lincoln john c. calhoun