Question: he Railroad to Freedom: A Story of the Civil War is a children's book that tells the fictionalized biography of Harriet Tubman, famous for her humanitarian work during what war?
Context: Harriet Tubman Underground Railroad State Park is a Maryland state park dedicated to the life and work of abolitionist and Underground Railroad activist Harriet Tubman. Kate Clifford Larson is an American historian and Harriet Tubman scholar.  Her 2003 biography of Harriet Tubman, "Bound for the Promised Land" was one of the first non-juvenile Tubman biographies published in six decades.  Larson is the consultant for the Harriet Tubman Special Resource Study of the National Park Service and serves on the advisory board of the Historic Context on the Underground Railroad in Delaware, Underground Railroad Coalition of Delaware. SS "Harriet Tubman" (MC contract 3032) was a Liberty ship built in the United States during World War II.  She was named after Harriet Tubman, an African-American abolitionist and spy during the American Civil War. Harriet Tubman Grave is an historic gravesite located in Fort Hill Cemetery at Auburn, in Cayuga County, New York.  The granite gravestone marks the resting place of famed African-American abolitionist and humanitarian Harriet Tubman, who was born into slavery in Maryland in the United States in 1820. The Railroad to Freedom: A Story of the Civil War is a children's book by Hildegarde Hoyt Swift.  It is a fictionalized biography of Araminta Ross (later known as Harriet Tubman) telling of her life in slavery and her work on the Underground Railroad.  The book, illustrated by James Daugherty, was first published in 1932 and was a Newbery Honor recipient in 1933. The Harriet Tubman Memorial Garden is part of the Harriet Tubman Underground Railroad Byway (Maryland) and is located in Cambridge, Maryland.  It honours the life of abolitionist Harriet Tubman and the journeys of the many people she assisted to escape slavery.  The garden features information boards and murals, some of which were painted by Charles Ross, a relative of Tubman's. The Harriet Tubman Memorial, also known as Swing Low, is located in Manhattan, New York City, New York, and honours the life of abolitionist Harriet Tubman.  The intersection at which it stands was previously a barren traffic island, and is now known as "Harriet Tubman Triangle".  As part of its redevelopment, the traffic island was landscaped with plants native to New York and to Tubman's home state of Maryland, representing the land which she and her Underground Railroad passengers travelled across. Harriet, the Woman Called Moses is an opera in two acts composed by Thea Musgrave who also wrote the libretto which is loosely based on episodes in the life of the American abolitionist and former slave Harriet Tubman.  The opera premiered on 1 March 1985 in Norfolk, Virginia, performed by Virginia Opera with subsequent broadcasts of the Virginia Opera production on National Public Radio and BBC Radio 3.  Musgrave later wrote two shortened versions of the opera—The Story of Harriet Tubman (premiered 1993) and Remembering Harriet (premiered 2006). Raymond S. Lane, Jr., sculptor, created a series of hand-built clay sculptures about Harriet Tubman an Underground Railroad conductor, called “the Moses of the anti-slavery movement” by Cincinnati Enquirer reporter Allen Howard, was first displayed in 2002 in the Children's Learning Center of the Public Library of Hamilton County’s main building, 800 Vine St. in downtown Cincinnati.  The clay works depict scenes in the life of the 19th century Underground Railroad heroine.  The exhibits is called “Harriet Tubman's Experience in the Underground Railroad.”  The sculptures currently are displayed at the Harriet Beecher Stowe House in Cincinnati, Ohio. Harriet Tubman (born Araminta Ross;  1822 March 10, 1913) was an American abolitionist, humanitarian, and an armed scout and spy for the United States Army during the American Civil War.  Born into slavery, Tubman escaped and subsequently made some thirteen missions to rescue approximately seventy enslaved people, family and friends, using the network of antislavery activists and safe houses known as the Underground Railroad.  She later helped abolitionist John Brown recruit men for his raid on Harpers Ferry, and in the post-war era was an active participant in the struggle for women's suffrage.
Answer: the American Civil War