What effect did the seven hills have on ancient rome?

Answer 1

The hills were great lookout places incase enemys come to attack.

Also, it is easier to attack from uphill because any one going up a hill would get tired running up. The aim is better from the top of a hill.

Answer 2

In the early days of Rome. before a full circuit of walls was built, the hills provided protection against raids. They were also safe from malaria.