What dynasty was in control when the main part of the great wall of china began being built

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

How did justinian attempt to revive the “glory of rome”?

What does the document of the birtish octopus is an uderlying cause of the world war 1