D
the war overall stabilized the economy.
Lincoln freed the slaves by signing the emancipation proclamation.
They call it the World War because 1914-1918 was the first of a particular type of international conflict the world's first industrialised "total" war - which had been followed by a second industrialised world war of this kind - 1939-1945.
The Grand Canyon is located in the state Arizona
D. The price of corn would increase because there isn’t as much of it.