The Grand Army of the Republic (GAR) was a fraternal organization composed of veterans of the Union Army (United States Army), Union Navy (U.S. Navy), Marines and the U.S. Revenue Cutter Service who served in the American Civil War for the United States forces. Founded in 1866 in Decatur, Illinois, and growing to include hundreds of posts (local community units) across the nation (predominately in the North, but also a few in the South and West), it was dissolved in 1956 at the death of its last member, Albert Woolson (1850–1956) of Duluth, Minnesota. Linking men through their experience of the war, the G.A.R. became among the first organized advocacy groups in American politics, supporting voting rights for black veterans, promoting patriotic education, helping to make Memorial Day a national holiday, lobbying the United States Congress to establish regular veterans' pensions, and supporting Republican political candidates. Its peak membership, at more than 490,000, was in 1890, a high point of various Civil War commemorative and monument dedication ceremonies. It was succeeded by the Sons of Union Veterans of the Civil War (SUVCW), composed of male descendants of Union Army and Union Navy veterans. Grand Army of the Republic - Wikipedia
Albert Henry Woolson (February 11, 1850 – August 2, 1956) was the last surviving member of the Union Army who served in the American Civil War. He was also the last surviving Civil War veteran on either side whose status is undisputed. At least three men who followed him in death claimed to be Confederate veterans, but one has been debunked and the other two are unverified. The last surviving Union soldier to see combat was James Hard (1841–1953).[1] Albert Woolson - Wikipedia
Pleasant Riggs Crump (December 23, 1847 – December 31, 1951) is the last verifiable veteran who fought for the Confederacy during the American Civil War. Although he was survived by several other claimants in the 1950s, such as William Lundy, John B. Salling and Walter Williams, historical research has subsequently debunked these claims. Crump officially remains the last surviving veteran of the Confederate Army. Pleasant Crump - Wikipedia Last surviving Confederate veterans - Wikipedia