What primary method does lincoln use to appeal to readers to make his argument against slavery

-Lincoln uses his power and authority to make his argument against slavery.

Primary Example:

Lincoln used his authority and power as the president and wrote and released the "Proclamation for Amnesty and Reconstruction" it granted the Southern states to join the Union again if they abolished slavery.

answer: sure

explanation: i'd love to know everything but that burden is too much to bare.