Answer:
Knowledge.
Step-by-step explanation:
The main difference is the presence of knowledge which made Africa, Asia, and the Middle East more developed and modern during the Middle Ages as compared to Europe because in Europe no importance was given to the knowledge by the people which leads to the development of other nations as compared to dark age of the Europe. Other parts of the world experienced “golden ages” during a time when most of the Europe struggled through the Dark Ages because of knowledge which enables other nations to made better their lives.