Why did Lincoln fear the acceptance of black soldiers?

Lincoln feared the acceptance of black soldiers for several reasons, primarily due to prevailing racial prejudices and concerns about public opinion. He worried that enlisting Black men could alienate border states and some Northern Democrats, potentially jeopardizing the Union war effort. Additionally, there were fears over how the integration of Black soldiers would affect morale and social dynamics within the predominantly white military ranks. Ultimately, Lincoln recognized the strategic necessity of using Black soldiers but was cautious about the political ramifications.