ranging from the anti-communist crusades of Senator Joseph McCarthy in the 1950s to the radical antiwar protests at UW-Madison that culminated in the Sterling Hall bombing in August 1970. The state undertook welfare reform under Republican Governor Tommy Thompson during the 1990s. The state's economy also underwent further transformations towards the close of the 20th century, as heavy industry and manufacturing declined in favor of a service economy based on medicine, education, agribusiness, and tourism. Two U.S. Navy battleships, BB-9 and BB-64, were named for the state. 21st century In 2011, Wisconsin became the focus of some controversy when newly elected governor Scott Walker proposed, passed, and enacted 2011 Wisconsin Act 10—referred to as the "Budget Repair Bill"—which made large changes in the areas of collective bargaining, compensation, retirement, health insurance, and sick leave of public sector employees, among other changes. A series of major protests by union supporters took place that year in response to the changes, and Walker survived a recall election held the next year, becoming the first governor in United States history to do so. Walker enacted other bills promoting conservative governance, such as a right-to-work law, abortion restrictions, and legislation removing certain gun controls. Walker's administration also made critical changes to Wisconsin's election process, enacting one of the most aggressive legislative gerrymanders in the country and replacing Wisconsin's nonpartisan state elections board with a commission of political appointees. When Walker lost re-election in 2018, he collaborated with the gerrymandered Republican legislature to strip powers from the incoming Governor and Attorney General. Since 2011, Wisconsin has seen increasing governmental dysfunction and paralysis, as the durable gerrymander insulates the legislature from electoral consequences. Geography Wisconsin is bordered by the Montreal River; Lake Superior and Michigan to the north; by Lake Michigan to the east; by Illinois to the south; and by Iowa to the southwest and Minnesota to the northwest. A border dispute with Michigan was settled by two cases, both Wisconsin v. Michigan, in 1934 and 1935. The state's boundaries include the Mississippi River and St. Croix River in the west, and the Menominee River in the northeast. With its location between the Great Lakes and the Mississippi River, Wisconsin is home to a wide variety of geographical features. The state is divided into five distinct regions. In the north, the Lake Superior Lowland occupies a belt of land along Lake Superior. Just to the south,