Emperor hadrian had a wall built to separate romans from the barbarians in what is now what country?

In the developed world, women are increasingly more likely to delay childbirth until their mid- to late- twenties or long because

Triangle xyz is translated 4 units up and 3 units left to yield triangle x'y'z' what is the distance between any two corresponding points on triangle xyz and trianglex'y'z' ?

What could the united states of america do to improve their status? name at least 3(ap human geography)