Demosthenes was a proud Greek who disliked the Macedonians as a nation, but he also hated the Macedonian people and everyone who lived on that geographical area. What Demosthenes wanted for the city-states was that they would rise up against them - this they eventually did too, so the answer would be; yes, they followed his "advice".
Answer:
The Himalayas
Explanation:
The huge mountains kept people from trading