What year did the U.S. Civil War officially conclude?

The Civil War officially concluded in 1865, which is marked by the surrender of General Robert E. Lee's Army of Northern Virginia to Union General Ulysses S. Grant at Appomattox Court House on April 9, 1865. This event is often cited as the symbolic end of the conflict, though some fighting continued in other areas for a short time after this surrender. The formal end of the war was further solidified with the surrender of other Confederate forces and the eventual disbandment of their armies. By June 1865, the majority of the remaining Confederate forces had surrendered, and by December of that year, the 13th Amendment abolishing slavery was passed, further cementing the conclusion of the war's contentious issues. Therefore, 1865 is recognized as the definitive year when the U.S. Civil War came to an official end.