How did the frontier differ from the settled areas along the east coast

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.

When zhang qin went to explore west, he brought back stories of

Which us president proposed a decimal based measurement system for the us