Answers (1)
"Countries" is a rather recently invented concept. There are between 190 and 250 countries in the world. The number varies, sometimes on a daily basis. Only 21 of them have a regime older than a century. Libya had a king for 2800 years, but switched to a president in 1975. So if you want to compare ancient history to modern political boundaries, you need to specify a date, and even then the results will be disputable.
You can get general info at en.wikipedia.org/wiki/Alexander_the_Great