AAlexander’s most important legacy was clearly not political unity. Instead it was the spread of Greek ideas and traditions across a wide area, a process scholars later called Hellenization. To maintain contact with the Greek world as he moved farther eastward, he founded new cities and military colonies and expanded existing cities, settling Greek and Macedonian troops and veterans in them. Besides keeping the road back to Greece open, these settlements helped secure the countryside around them. This practice continued after his death, with more than 250 new cities founded in North Africa, West and Central Asia, and southeastern Europe. These cities and colonies became powerful instruments in the spread of Hellenism and in the blending of Greek and other cultures.