Which battle is known as the bloodiest single-day battle in American history, resulting in almost 23,000 casualties?

The battle known as the bloodiest single-day battle in American history, resulting in almost 23,000 casualties, is Antietam. Fought on September 17, 1862, during the American Civil War, the Battle of Antietam had a profound impact on the course of the conflict. The staggering number of casualties included soldiers who were killed, wounded, or missing, reflecting the intensity and brutality of combat during that time.

Antietam is particularly significant not only for its high casualty rates but also because it provided a strategic victory for the Union. It halted Robert E. Lee's invasion of the North and gave President Abraham Lincoln the opportunity to issue the Emancipation Proclamation, which fundamentally altered the purpose of the war. The battle was a turning point that helped to preserve the Union, making it a pivotal moment in American history.