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Minnesota is the 32nd state of the United States, having joined the Union on May 11, 1858. Its name is from the Dakota people's name for the Minnesota River, mini sota, variously translated "smoky-white water" or "sky-tinted water." The state's name is abbreviated MN or Minn. Minnesota is the second largest state by land area in the Midwestern United States and is in the sub-region known as the Upper Midwest. The most significant metropolitan area is known as the Twin Cities, which contains more than half the state's population. The Twin Cities refer to the state's most populous cities: Minneapolis and Saint Paul, along with multiple "rings" of suburbs. The remainder of the state is generically referred to as "Greater Minnesota", or "outstate Minnesota" by analogy to upstate New York. The state is a major food producer for the country, and has a number of natural resources that have been greatly exploited in the last two centuries. The USS Minnesota was named in honor of this state, as was the SS Gopher State. Other nicknames for the state include The Land of 10,000 Lakes, North Star State, The State of Hockey. Minnesota covers 79,610 square miles (2.25% of the United States). It is famous for its lakes, having in excess of 15,000, depending on the source of the count. Much of the state is flat, having been eroded during repeated glacial periods (most recently the Wisconsin Glacier). However, the extreme southeastern portion of the state is part of the Driftless Zone, which was not glaciated, and it is here that Lake Pepin and the rugged high bluffs of the Mississippi River are found. In addition, the Iron Range and other low mountains are found in the northeastern part of the state. The Minnesota portion of Lake Superior is the largest body of water in the state. Minnesota is home to many areas of park land, to the Boundary Waters Canoe Area Wilderness (BWCAW), as well as a number of state and county parks, most notably Itasca State Park, the official source of the Mississippi River. Two continental divides meet in the northwestern part of Minnesota, and rain falling in the state can follow the Mississippi south to the Gulf of Mexico, the St. Lawrence Seaway east to the Atlantic Ocean, or North America's northern watershed to the Arctic Ocean. After its rivers and lakes, Minnesota's most prominent physical feature is the Iron Range. This is a range of low mountains that run across the northern part of the state. It is called the Iron Range because when discovered, it had some of the largest deposits of iron ore in the country. Although the high-grade iron ore was mostly mined out during World War II, taconite is still mined across the Iron Range.
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