Final answer:
Abraham Lincoln's governance during the Civil War influenced American principles by promoting the abolition of slavery and emphasizing liberty and equality. His policies and actions had a lasting impact on American history.
Step-by-step explanation:
Lincoln's strong commitment to preserving the Union and promoting the abolition of slavery became central principles of the war effort. He believed that freeing the southern slaves would weaken the Confederacy and ultimately lead to the end of the war. His Emancipation Proclamation, although not an immediate solution, contributed to the eventual emancipation of enslaved blacks and shifted the focus of the war towards emancipation, freedom, and citizenship.
By issuing the Emancipation Proclamation and advocating for the end of slavery, Lincoln's governance during the Civil War reflected American principles of liberty, equality, and justice. His government's policies and actions laid the foundation for the abolition of slavery and the eventual end of the war, creating a lasting impact on American history.