Which fact most clearly shows the difficulty in defending the roman empire against invasion? a. at its height, the empire likely had a population as high as 100 million. b. at its height, the empire comprised nearly 1.7 million square miles of land and water. c. over the course of its history, the roman empire built about 55,000 miles of paved roads. d. the mediterranean sea stretches about 2,300 miles west to east and about 600 miles from italy to the african coast.

The correct answer is B. At its height, the empire comprised nearly 1.7 million square miles of land and water.

The most important difficult to defend the Roman empire against invasion were the extension of its territory and its frontier.

Other aspects were positives because a great population allowed to have a bigger army, the paved roads helped to the faster communication and sending of troops, and the extension of the Mediterranean Sea functioned as a natural barrier, even more if we consider that the Roman navy was much more superior than their enemies.

The Barbarian Germanic tribes made a big pressure around the Northern and West Northern Limes (Frontier in Latin Language), so they had to send a great number of soldiers to protect the Empire against them.

Finally, when the empire was in a week situation, it was destroyed by the invasion of those people.

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!