Which of these describes an economic effect of the Civil War?
Fields were left unplanted because the slaves had been freed and much of
the male population was unavailable to plant or harvest crops.
Over 600,000 men died, mostly because of the lack of food, clean water,
and hygienic medical practices.
After the Emancipation Proclamation was issued, African Americans were
-allowed to join the Union Army.
Lincoln's assassination after the surrender caused a disruption in the
rebuilding of the nation.

The fields were left unplanted because the slaves had been freed and much of the small population was unavailable to plant or harvest crops.

Explanation:

There are still economic consequences caused by the Civil War. However, this one is undoubtedly one of the most significant. The post-war economy of the South was devastated because it had previously rested on the slave labour force. The fields that were already cultivated were left blank, and according to some records, the South lost over $ 2 billion. The result is the release of some 4.5 million who worked in cotton fields in the South.

it increased the power of the king of england.

the answer to your question is c