Which of these contributed to the Union victory in the Civil War? (1 point)
A. a blockade of Southern ports
B. alliances with France and Britain
C. the outbreak of slave rebellions in the South
D. Virginia's failure to secede from the Union
A. a blockade of Southern ports
B. alliances with France and Britain
C. the outbreak of slave rebellions in the South
D. Virginia's failure to secede from the Union