Abraham Lincoln had the greatest impact of any individual in advancing the position of African Americans in the USA, how valid is this view of the years 1776-1877?

INSTRUCTIONS:
ULTIMATELY, ARGUING THAT IT IS THE CASE HE HAD THE GREATEST IMPACT

EVERY DECADE MUST BE COVERED

3 PRIMARY SOURCES NEED TO BE USED, EMBEDDED – WITH EVALUATION OF LIMITATIONS AND USES OF SOURCE IN SUPPORT OF ARGUMENT (THAT HE HAD THE GREATEST IMPACT) ( ONE SOURCE INCLUDED IN ATTACHMENTS THAT CAN BE USED)  – SOURCES NEED TO BE IN APPENDIX TOO

MENTION OF AN HISTORIAN WHO FURTHER SUPPORTS ARGUMENT TWO OTHER ABOLITIONISTS TO BE MENTIONED THAT COULD BE MORE IMPACTFUL WITH ANALYSIS AND EVALUATION – WILLIAM LLOYD GARRISON + FREDERICK DOUGLASS TWO INTERPRETATIONS FROM SCHOLARLY SOURCES THAT SPEAK ON LINCOLN’S IMPACT, WITH EVALUATION + ANALYSIS, IDENTIFYING FLAWS IN THE INTERPRETATIONS (INTERPRETATIONS HAVE BEEN ATTACHED) INCLUDE APPENDIX AND BIBLIOGRAPHY