What letter on the map represents the barrier that helped protect Rome from invasion? A) B) C) Eliminate D)

Without the actual map or additional context, I cannot accurately identify which letter represents the barrier that helped protect Rome from invasion. A map typically uses letters or symbols to represent different geographical features or points of interest, and you need to refer to the map's legend or key for the correct interpretation. If the map is referencing a well-known barrier associated with the protection of Rome, it is likely referring to the Roman walls or the famous Hadrian's Wall which was built in Britain to keep out the Picts and other tribes. To find the right answer, you would need to look at the places or features indicated by letters A, B, C, and D, and match them with the correct historical barrier.

Extra: Rome throughout its history had several fortifications and barriers that contributed to its defense. The most famous defenses of the city of Rome itself are the Servian Wall and the Aurelian Walls. The Servian Wall was built during the early Republic, and the later Aurelian Walls were constructed in the 3rd century AD under Emperor Aurelian. These fortifications expanded with the city and were designed to protect Rome from invasions by barbarian tribes and other enemies.

Outside of Italy, the Romans built many defensive structures to protect their empire's frontiers. Perhaps the most famous of these is Hadrian's Wall in northern Britain, built on the orders of Emperor Hadrian in 122 AD. This wall stretched across the width of Britain and was designed to keep the northern tribes out of the Roman province of Britannia.

Understanding the geography and historical context of barriers like walls and fortifications can help students appreciate how geography and human-made structures have shaped the political and military history of civilizations like Rome.