Given that the American Civil War was fought between 1861 and 1865, it seems impossible that the last civil war widow died at the end of 2020. There were a number of civil war widows who have died recently, but Helen Viola Jackson was the last.
How could that be, you ask? Simply put, the Civil War veterans were very old (in their nineties), and their brides were very young (still teenagers). Still, the mind boggles!
Here is some more information on the longest surviving Civil War Widows.