1858 – Current Three years after the admission of Minnesota into the Union as the 32nd U.S. state, explode the American Civil War in 1861 against 11 states in the U.S. South, which had split the country and formed Confederate States of America. Minnesota was the first state to offer troops to the Union to fight the Confederates. In August 1862, while occurring relatively far from the State the major battles and conflicts of the Civil War, the Sioux made a major attack on the communities inhabited by Americans of European descent. In this attack, the Sioux killed over 500 people and destroyed several communities and plantations. Minnesota militia and U.S. forces finally defeated the Sioux. After the Civil War’s end, Minnesota was in a period of high growth and economic prosperity.He built large numbers of mills to process the wheat grown in the region, factories were built in Minneapolis, and railways came to connect Minnesota with the rest of the country. Besides, the state government, along with the railway companies, was interested in attracting more people to the region. The government of Minnesota and railway companies large amounts of leaflets distributed in Europe, especially in the newly united Germany and Scandinavia. Large numbers of European immigrants, mostly Germans, and to a lesser extent, Norwegian, Swedish and Irish, settled in the State between the 1870s and 1890s. In the early 1880s, the discovery of vast iron deposits in Minnesota. Several more would be discovered in 1890, and even later, in the late 1910s. The iron ore quickly became one of the main sources of government revenue. Family of Minnesota in 1890.In 1889, William W. Mayo and his two sons founded a medical clinic, the Mayo Clinic (Mayo Clinic) in Rochester. The clinic became well known in the state, and finally the family in May turn what initially was a small clinic in a hospital. Currently, the Mayo Clinic is one of the medical research world’s most prestigious. In 1894, a major fire broke out in the woods of Minnesota, known as the Great Hinckley Fire. The fires spread over nearly a thousand square kilometers of forest, killing approximately 400 people and nearly a million dollars in damages. Subsequently, in 1918, there would be another great fire, claiming again death of about 400 people, and this time, causing more than 25 million in damages. The period of great prosperity and economic growth in Minnesota would be extended until the mid-1920s.However, this prosperity, for the most part, enjoyed only the railroad companies (who charged a lot for the transport of products produced in Minnesota to other regions of the country), and banking institutions and politicians. During the 1890s and 1900s, large numbers of farmers, miners and industrial workers joined trade unions and cooperatives. After the First World War, which significantly increased sales of iron ore and agricultural products, and encouraged the industrialization of the state-these groups would join together to form the Agrarian-Labor Party, which supported small farmers and workers industrial. The first politician of that party to become governor of Minnesota, Floyd B. Olson was elected Governor of the State in 1931.Minnesota went on to face the first signs of economic recession during the 1920s because of low prices and low demand for agricultural products and iron ore produced in Minnesota. Many farms were severely indebted. This deeper recession worsened the Great Depression of the 1930s, when domestic demand for the two major sources of state revenue-wheat and iron ore had fallen sharply across the country. Large numbers of workers lost their jobs. About 70 of workers who worked in the mining of iron, for example, were dismissed. Many farmers, who were dealing with the debt, low prices, drought and plagues of grasshoppers, wereforced to abandon their farms and move to the cities.The government of Minnesota and the United States conducted various programs to provide socio-economic and public buildings in an attempt to minimize the effects of the Depression in the state. Meanwhile, mining companies began extracting iron primarily taconite, a type of iron is cheaper and lower quality, which currently constitutes about 30 of the iron produced in Minnesota.