The war is a central event in American collective memory. There are innumerable statues, commemorations, books, and archival collections. The memory includes the home front, military affairs, the treatment of soldiers, both living and dead, in the war's aftermath, depictions of the war in literature and art, evaluations of heroes and villains, and considerations of the moral and political lessons of the war. The last theme includes moral evaluations of racism and slavery, heroism and cowardice in combat and behind the lines, and issues of democracy and minority rights, as well as the notion of an "Empire of Liberty" influencing the world.