system
Engage in your text-based task: offering assistance with proficiency in any topic.
human
Expand the following paragraph with more historical context to provide a deeper understanding of the subject.

Relevant data:
'The Civil War was a pivotal moment in American history.'
gpt
The Civil War, which lasted from 1861 to 1865, was fought between the Confederate States of America, who seceded from the Union, and the Union forces. It was the deadliest war in American history, claiming more than 600,000 lives and resulted in the abolition of slavery.