Final answer:
President Lincoln places the responsibility upon the American people to never forget the sacrifice of those who died in the Battle of Gettysburg and ensure a new birth of freedom.
Step-by-step explanation:
In his Gettysburg Address, President Lincoln places the responsibility upon the American people to never forget the sacrifice of those who died in the Battle of Gettysburg. He states that it is fitting and proper to dedicate a portion of the battlefield as a final resting place for the fallen soldiers. Lincoln emphasizes that their deaths should not be in vain, and the American people should be devoted to the cause for which they gave their lives - to ensure that the nation 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.