Alfred Thayer Mahan was a United States naval officer, historian, and one of the most influential American authors of the nineteenth century.
He argued that modern navies needed repair and coaling stations, which would not be dependable if controlled by other nations. This reasoning implied a justification for American acquisition of colonies to develop port facilities throughout the world.
Answer:
The purpose was to dedicate the people who lost during the battle of Gettysburg along with the entire war. He believed that we should finish the war and not let the people who died from it die in vain.