American Civil War: Led by Colonel Robert Gould Shaw, the 54th Massachusetts Infantry Regiment, one of the first African-American military units in the Union Army, spearheaded an assault (pictured) on Fort Wagner, South Carolina.

The American Civil War was a civil war in the United States between the Union and the Confederacy, which was formed in 1861 by states that had seceded from the Union. The central conflict leading to war was a dispute over whether slavery should be permitted to expand into the western territories, leading to more slave states, or be prohibited from doing so, which many believed would place slavery on a course of ultimate extinction.

Robert Gould Shaw was an American officer in the Union Army during the American Civil War. Born into an abolitionist family from the Boston upper class, he accepted command of the first all-black regiment in the Northeast. Supporting the promised equal treatment for his troops, he encouraged the men to refuse their pay until it was equal to that of white troops' wage.

The 54th Massachusetts Infantry Regiment is an infantry regiment that saw extensive service in the Union Army during the American Civil War. The unit was the second African-American regiment, following the 1st Kansas Colored Volunteer Infantry Regiment, organized in the Northern states during the Civil War. Authorized by the Emancipation Proclamation, the regiment consisted of African-American enlisted men commanded by white officers. The 54th Massachusetts was a major force in the pioneering of African American civil war regiments, with 150 all-black regiments being raised after the raising of the 54th Massachusetts.

During the American Civil War, the United States Army, the land force that fought to preserve the collective Union of the states, was often referred to as the Union army, the federal army, or the northern army. It proved essential to the restoration and preservation of the United States as a working, viable republic.