I certainly won't write your essay for you but I'd recommend doing your paper on Alexander III of Macedon aka Alexander the Great as he was a very influential and interesting figure in Greek history. Although king of ancient Macedonia for less than 13 years, Alexander the Great changed the course of history. One of the world's greatest military generals, he created a vast empire that stretched from Macedonia to Egypt and from Greece to part of India. This allowed for Hellenistic culture to become widespread.
The geographic feature which served as a barrier to the political union of the Greek city-states and their independence from each other was the numerous mountains all over the geography of the Hellenic Peninsula or Greek Mainland.
In general, the relationship that existed between the French and the Natives in North America was better than that of any relationship the Natives had with other Europeans, since many alliances and partnerships were formed (such as that one during the French and Indian War against the British).