Which of the Following Is False

Which of the following is false?

A) The completion of the national railroad network by 1890 led to the development of a national American market rather than just a series of smaller regional markets.
B) Before the Civil War the North and the South were in agreement on the issue of protective tariffs,but were in conflict over the spread of slavery into the new Western territories.
C) The U.S.was the first mass-consumption society.
D) From 1900 to the end of World War I,U.S.farmers prospereD.