How can a physical map explain the historical development of a country

The physical map would show some features that make natural borders, such as rivers, shores, mountain ranges. Those features are then likely places for borders, since they're hard to attach and easy to defend, and the physical features explain why the border is where it is and not for example 5 km next to them

Assuming this is a question on a test just name a restaurant by your house and the state you live in, its not too difficult : )