The firing on Fort Sumter had the effect of
a. pushing ten other states to join South Carolina in seceding from the Union.
b. causing Lincoln to declare a war to free the slaves.
c. strengthening many Northerners' view that the South should be allowed to secede.
d. arousing enthusiastic Northern support for a war to put down the South's rebellion.
e. making the North aware that the Civil War would be long and costly.
Answer: D