When the Civil War began, both the North and the South mistakenly anticipated a short war because __________.
A.
neither side realized how deeply the other felt about the issues of slavery and states' rights
B.
the North underestimated the economic power of the South
C.
the problems of the South in raising an army gave the North a wrong idea of Southern military strength
D.
both the North and the South had large groups which opposed the war