Final answer:
Roosevelt uses the Abraham Lincoln quote to support his own views.
Step-by-step explanation:
In his speech, Roosevelt uses the Abraham Lincoln quote "A house divided against itself cannot stand...this government cannot endure, permanently, half slave and half free." to support his own views. By referencing Lincoln's quote, Roosevelt is emphasizing the importance of unity and warning against division in a time of crisis. He uses this quote to convey a message of solidarity and rally support for his policies.