For what purpose was the phrase "one if by land, two if by sea" used

Tension between the british and boers was caused primarily by what things?

What is one way that the congress of vienna changed the map of europe?

Which of the following describes an effect of world war ll on the united states economy a. automobile companies produced a record number of cars b. many factories had to expand to produce military equipment c. the airplane industry suffered as the allies began using airplanes in combat d.cities with shipyards declined because so many ships had been sent overseas.