Explanation:

There were five different lines of communication between India and the West during the course of his campaigns. Of those, four routes were on land, and one by sea. Alexander voyages and campaigns enlarged the geographical horizon of both the western and eastern peoples.
 Alexander destroyed the power of the many existing states and wiped out the independent existence of some of them. When soon after his departure, the process of building a powerful Indian empire began, the states of the North-West were easily conquered and they formed a part of that empire. Alexander, in fact, made the work of Chandragupta Maurya simpler, and paved the path for his imperial power in the Greek invaded areas. Long after Alexander, this influence came to its admirable form in shape of the Gandhara School of Art.