read the passage:

we here highly resolve that these dead shall not have died in vain—that this nation, under god, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.why does lincoln allude to the declaration of independence here?
to demonstrate his disgust that more soldiers will die bloody deaths on the battlefield
to express hope that the current government will be reformed
to convey his pessimistic view that the civil war will never end
to express his fear that america will forget its original dedication to the ideals of freedom