Answer:The Gettysburg Address was given at the dedication of the Soldiers' National Cemetery in Gettysburg, Pennsylvania, four months after the Battle of Gettysburg during the American Civil War. It is a great speech because of its concise, powerful language, its eloquent expression of American ideals, and its ability to capture the essence of the struggle for freedom and equality that defined the Civil War. It is also a seminal work because it helped to establish the idea of a united, indivisible nation and inspire generations of Americans to continue the work of perfecting their democracy.