Table:
text: United States House of Representatives elections, 1926
Alabama
Alabama
District Incumbent Party First_elected Result_ Candidates
Alabama 1 John McDuffie Democratic 1918 Re-elected John McDuffie (D) 84.0% Aubrey Boyles (R) 16.0%
Alabama 2 J. Lister Hill Democratic 1923 Re-elected J. Lister Hill (D) Unopposed
Alabama 4 Lamar Jeffers Democratic 1921 Re-elected Lamar Jeffers (D) 68.1% Omar H. Reynolds (R) 31.9%
Alabama 6 William B. Oliver Democratic 1914 Re-elected William B. Oliver (D) 99.0% C. M. Ayers (R) 1.0%
Alabama 8 Edward B. Almon Democratic 1914 Re-elected Edward B. Almon (D) 90.1% Robert M. Sims (R) 9.9%

Question: When was incumbent William B. Oliver first elected to the United States House of Representatives in the 1926 Alabama election?