This depends on the country. See related questions or re-ask your question specifying the country.
United States: James Buchanan, replaced by Abraham Lincoln on March 4.
James Buchanan was the fifteenth President of the United States, serving from 1857 March 4 to 1861 March 4.
Abraham Lincoln was the sixteenth President of the United States, serving from 1861 March 4 to 1865 April 15 when he was assassinated.
For most of the war it was Abraham Lincoln(1809-1865), who proclaimed that the conflict was ultimately intended to "preserve the Union" of the United States. Actual hostilities began a month after his inauguration, on April 12, 1861. The major fighting in the War ended just 6 days before Lincoln was assassinated on April 15, 1865. Confederate forces under Robert E. Lee surrendered at Appomattox, VA, on April 9. The final shots of the war took place in June, 1865, after Vice President Andrew Johnson (1808-1875) succeeded to the Presidency on Lincoln's death.
(Jefferson Davis (1808-1889) was the President of the Confederate States of America from 1861 to 1865, leading the government of the South.)
Research somewere else ok
The President of the United States was our 16th President, Abraham Lincoln.
Abraham Lincoln followed by Andrew Johnson.
Abraham Licoln
The president of the US during the Civil War was Abraham Lincoln.
Abraham Lincoln was president of the USA in 1861 Jefferson Davis was president of the Confederacy in 1861
Abraham Lincoln, He knew slavery was wrong so the union states ware the states that knew slavery was wrong
Jay Hausemen Jay Hausemen
Jefferson Davis
Abraham lincoln
Abraham Lincoln was the president during the civil war.
Abraham Lincoln was the president during the civil war.
Abraham Lihcoln was the president during the US civil war.
Abraham Lincoln was the president during the Civil War.
Abraham Lincoln was President during the Civil War.
No, Abraham Lincoln was the President during the Civil War.
Abraham Lincoln was the first member of the newly-formed Republican party to be elected President. His term of office spanned the civil war almost precisely.
Abraham Lincoln was president during the US Civil War.
The Confederate President during the Civil War was Jefferson Davis.
There was no president of Southern Sudan during the civil war.
Abraham Lincoln (our 16th President) was President during the Civil War
Abraham Lincoln was President during the US Civil War.