Albert Woolson
Albert Henry Woolson 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 .
Woolson was born in Antwerp, New York to Willard P. Woolson and Caroline Baldwin . He claimed to be born on February 11, 1847, but his entry in the 1850 United States Census lists him as born in 1850. Entries in the later census records and in the 1905 Minnesota State Census support the conclusion that he was born in 1850.
Source: Wikipedia