The Alexandrian Egypt became a major center of learning in the classical world and was home to the most amazing library ever, which Julius Caesar probably accidentally burned down while trying to conquer a bunch of land to emulate his hero, Alexander the Great. Plus, the dead Alexander had a huge impact on culture. He gave the region its common language, Greek, which facilitated conversations and commerce. Greek was so widespread that archaeologists have found coins in what is now Afghanistan with pictures of their kings with the word king written beneath the pictures in Greek. This is also why, incidentally, the New Testament was eventually written in Greek. Although Alexander was mostly just conquering territory for the glory and heroism and greatness of it all, in his wake emerged a more closely connected world that could trade and communicate with more people more efficiently than ever before. Alexander didn't make those things happen, but they probably wouldn't have happened without him.