After a move to
Stromsburg,
Polk County, Nebraska, in 1881, Shallenberger became a clerk, a banker and a rancher. He moved to
Alma,
Harlan County, Nebraska, in 1887 and founded the Bank of Alma. He was first elected to the
57th United States Congress but failed to be reelected in 1902. According to Southwest Virginia folklore, in 1902 Shallenberger, Alma Journal editor H. S. Wetherald, and carriage dealer Frank Griggsby, were startled by the apparition of a
Woman in Black. His first attempt at the Governorship came in 1906, running under a Fusion label of the state Democratic and Populist parties, where he lost to Republican
George L. Sheldon. He was then elected governor in 1908, defeating Sheldon in a narrowly won rematch. Shallenberger served from 1909 to 1911, his tenure included the adoption of the State Guarantee of Deposits Law and the "Oregon Plan", a direct primary bill regarding the election of United States senators. He lost an attempt at a second term in 1910, losing in the Democratic primary to
James Charles Dahlman. Unsuccessful in running for
Senate from Nebraska in 1912, Shallenberger was elected a congressman to the
64th and
65th congresses (1915–1919), but was unsuccessful in being reelected to the
66th in 1918. He was a delegate to the
Democratic National Convention in 1920, and was elected to the
68th,
69th, and
70th congresses from 1923 to 1929. Unsuccessful in being reelected to the
71st in 1929, but was successful in running for the
72nd and
73rd (1931–1935). He failed to be renominated in 1934 and returned to banking and breeding
shorthorn cattle. Shallenberger was one of four governors (three of Nebraska, one of Wyoming) to come from the city of
Osceola, Nebraska. ==Death==