Abraham Lincoln (February 12, 1809 – April 15, 1865) was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through its Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy.Read about Abraham Lincoln in Wikipedia
I think that one of the causes of these repeated failures is that our best and greatest men have greatly underestimated the size of this question (slavery). They have constantly brought forward small cures for great sores-plasters too small to cover the wound. That is one reason that all settlements have proved so temporary-so evanescent.