Whati is an introduction or an explanation about what will follow?

An economic system where all or most businesses are owned by government

This is the mountain range known as the alps. which of these statements regarding the alps is true? a) the alps are the largest mountain range in asia. b) the alps protect the roman empire from invasion. c) the alps were key in preventing england from being conquered in warfare. d) the alps prevented the roman empire from taking control of most of europe.

Federalism began to spread super soon after