<human>:  With regards to the American Civil War, when did it end?
<bot>: The Civil War lasted from 1861 until 1865. It was the first major conflict in the United States to be fought entirely within its own territory. The war began as a dispute between the states of the southern United States and the northern United States over the issue of slavery. It was the deadliest war in the history of the United States. It resulted in 620,000 deaths and the destruction of entire cities, including the capital of Washington, D.C.