Lincoln mentions the Declaration of Independence but discusses none of its specific passages. This is most likely because

answer:

The positive conclusion that Lincoln drew from his historical research pointed through the Constitution and laws of the United States to their animating principles in the Declaration of Independence. This was to be a political regime in which no one had a right to govern another man without first securing his consent.

Explanation:

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.