He didn’t complete a full term in any of his elected positions
He didn’t complete a full term in any of his elected positions - one of the interesting facts about Jefferson Davis. In recognition of Davis' military service, Mississippi Governor Albert G. Brown appointed him to fill the seat of Democratic U.S. Senator Jesse Speight, who had passed away on May 1st, 1847. Davis, a fellow Democrat, assumed his interim position on December 5. He was later chosen by the state assembly to complete the remaining two years of the term in January 1848.
On December 3, 1849, at the start of the first session of the 31st United States Congress, the Senate appointed Davis head of the Committee on Military Affairs. He was elected to a full six-year term on December 29. (by the Mississippi legislature, as the constitution mandated at the time). When Davis resigned (in September 1851) to run for governor of Mississippi over his opposition to the Compromise of 1850, he hadn't even been in office for a year.
Jefferson Davis is chosen as the Confederate States of America's president on November 6, 1861. According to the Confederate constitution, Davis was elected to a six-year term on November 6, 1861. He served as president until the Confederate government was formally abolished on May 5, 1865.