Answer:
world War 1 if I'm not wrong
Answer:
boys of the upper classes, or boys
Great Britain proved that they could defeat the most powerful Navy that existed at the time. Great Britain than became known as the most powerful naval force.
The south was the side that had the cotton, so B is the only one that makes sense. A is wrong because the north was manufacturing. C and D don't make sense for the same reason. I think it is B.