To understand Abraham Lincoln's viewpoint on slavery, it would be important to

analyze his appointment of so many military commanders
examine the Emancipation Proclamation and review why he supported of the 13th
Amendment
study his position about the economy in the Election of 1860
read the Gettysburg Address

evaluate his speeches and writings on the subject of slavery, such as his debates with Stephen Douglas during the Lincoln-Douglas debates

consider his relationship with Frederick Douglass and other anti-slavery activists
examine his personal beliefs and moral convictions regarding slavery and freedom
look at the impact of slavery on the Civil War and Lincoln's view on its role in the conflict
determine how his views on slavery evolved over time
consider the political and societal factors that influenced Lincoln's stance on slavery.