Bierstadt's "Bombardment of Fort Sumter" is no longer considered a Bierstadt, but a work by the Confederate painter, John Ross Key.
You mistakenly attribute "The Bombardment of Fort Sumter" to Albert Bierstadt. The painting was done by John Ross Key. See The Magazine Antiques, February 1986, pp,416-422. It is now in the Greenville County Museum, Greenville, SC as by Key.
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thank you, we've removed the image from Bierstadt's page