William B. Allison was an American politician and a member of the Republican Party. He served as a U.S. Senator from Iowa from 1897 to 1908. During his time in office, he focused on issues such as agriculture and economic development, representing the interests of his constituents. Allison was known for his role in shaping legislation related to tariffs and federal appropriations. He was influential in the Senate, serving as the chairman of the Appropriations Committee. His contributions helped to establish policies that impacted the growth of the American economy during the early 20th century.