What theme is shared by the gettysburg address in the declaration of independence

The issue shares the direction of gettysburg in the declaration of independence, is when Lincoln raises the issue of the "great civil war" in which the nation was involved.

With his memorable first sentence, where Lincoln speaks of the project of American democracy as "A new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal."

the rhyme scheme is abab cdcd efef gg.