Which of the following caused the Phoenicians to rely upon the sea for travel and trade?

Mountains to the east blocked easy access to east and left little land for farming. Syrian enemies to the north and east threatened to attack their trade routes. They were unable to cross the Tigris River going east.1

the american civil war was not caused   by slavery but by economic factors.

on a flat and narrow coastal plain, between the foothills of the brazilian highlands and the atlantic ocean, on the shore of guanabara bay, in the state of rio de janeiro, brazil, the tropical zone in south america.