In which part of this excerpt from the gettysburg address does president abraham lincoln argue that the outcome of the war will depend on the determination and loyalty of northern citizens?

The part of the excerpt from the gettysburg in which Abraham Lincoln Argue that the outcome of the war will depend on the determination and loyalty of northern citizens would be :
'The brave men, living and dead, who struggled here, have consecrated it,far above our poor power to add and detract

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