Answer:
Both speeches indicate a desire to motivate and unite Americans in order to preserve freedom.
Step-by-step explanation:
The thing that these speeches have in common is that both speeches indicate a desire to motivate and unite Americans in order to preserve freedom. In the first speech, Lincoln states that it is the job of those who are still living to finish the fight for freedom that those in past generations have carried out. In Kennedy's speech, he explains that the present generation has the responsibility of defending freedom in its hour of maximum danger. Both excerpts talk about the importance of Americans uniting in order to preserve freedom.