Which United States Secretary of War under Franklin Pierce was elected President under the Provisional Confederate States Constitution?
Confederate States presidential election, 1861:  Jefferson Davis, who had been elected President and Alexander H. Stephens, who had been elected Vice President, under the Provisional Confederate States Constitution, were elected to six-year terms (February 22, 1862 – February 22, 1868) as the first permanent President and Vice President of the Confederate States of America. Jefferson Davis:  He was the 23rd United States Secretary of War, serving under U.S. President Franklin Pierce from 1853 to 1857.
Jefferson Davis