Natural law is the higher order positive law which emerged from the philosophers of ancient age. Stoic reformers believed that law of nature is the supreme law which connects man and nature to live in harmony with each other.
Aristotle says that though man perceives things and frames laws to live an orderly life, the natural law is universal and a common law exists which is divine.
Natural rights are the rights which are believed to be inherited by birth of a man. These are natural birth rights and they are the base for the founding fathers to frame the US Constitution.
Both speeches focus on the history of fighting for a cause leading up to the Civil War. The US was built on revolutionary spirit and men's lives lost for the bigger idea of freedom. The deaths of the men will mean something because the cause of the war means something.
These addresses revitalized the Union effort and reminded the men of the long history they were now a part of. They stand on the side of freedom and that will be meaningful. This dedicate brought up morale in Union forces.
What of the following am i supposed to choose from?