When did the American Civil War end?
The American Civil War formally concluded on August 20, 1866 when President Andrew Johnson issued a proclamation declaring that civil authority was restored in all of the states.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: When did the American Civil War end?
### Input: 
### Response: The American Civil War formally concluded on August 20, 1866 when President Andrew Johnson issued a proclamation declaring that civil authority was restored in all of the states.