Question: When did the drinking age become 21 in the state where Song of the Pines takes place?

full_context: Document 1: Alcohol laws of Wisconsin: The drinking age in Wisconsin is 21. Those under the legal drinking age may be served, possess, or consume alcohol if they are with a parent, legal guardian, or spouse who is of legal drinking age. Those age 18 to 20 may also possess (but not consume) alcohol as part of their employment.
Document 2: Little House on the Prairie: On the Banks of Plum Creek, published in 1937 and fourth in the series, follows the Ingalls family as they move from Pepin, Wisconsin to Kansas to an area near Walnut Grove, Minnesota, and settle in a dugout ``on the banks of Plum Creek (Redwood County, Minnesota) ''. In reality, the occurrences and anecdotes in the first book Little House on the Prairie took place after their return from Indian Territory. The Ingalls family left for their journey to Minnesota on Laura's seventh birthday, February 7, 1874. In this book, Laura is between the ages of seven to nine years old, which was chronologically correct.
Document 3: O Pioneers!: "O Pioneers!" tells the story of the Bergsons, a family of Swedish-American immigrants in the farm country near the fictional town of Hanover, Nebraska, at the turn of the 20th century. The main character, Alexandra Bergson, inherits the family farmland when her father dies, and she devotes her life to making the farm a viable enterprise at a time when many other immigrant families are giving up and leaving the prairie. The novel is also concerned with two romantic relationships, one between Alexandra and family friend Carl Linstrum and the other between Alexandra's brother Emil and the married Marie Shabata.
Document 4: When the Robbers Came to Cardamom Town: When the Robbers Came to Cardamom Town () is a 1955 Norwegian children's book written and illustrated by Thorbjørn Egner, which tells the story of Kardemomme by (Cardamom Town). It is considered as one of the most important Norwegian children's books. The book includes many songs which are connected to the story. The story is well adapted for playing as a theatre act with musical elements.
Document 5: Alcohol laws of New York: In response to the National Minimum Drinking Age Act in 1984, which reduced by up to 10% the federal highway funding of any state which did not have a minimum purchasing age of 21, the New York Legislature raised the drinking age from 19 to 21, effective December 1, 1985. (The drinking age had been 18 for many years before the first raise on December 4th, 1982, to 19.) Persons under 21 are prohibited from purchasing alcohol or possessing alcohol with the intent to consume, unless the alcohol was given to that person by their parent or legal guardian. There is no law prohibiting where people under 21 may possess or consume alcohol that was given to them by their parents. Persons under 21 are prohibited from having a blood alcohol level of 0.02% or higher while driving.
Document 6: Norway Lutheran Church and Cemetery: The Norway Lutheran Church and Cemetery are located 10 miles south of Denbigh, North Dakota and were listed on the National Register of Historic Places (NRHP) in 1994. The NRHP listing includes the main church structure, a cemetery, and two contributing privies to the west and rear of the church, all situated on a site. A pyramid-shaped monument topped with an iron cross is located at the northeast corner of the cemetery and marks site of an older log church. Norwegian skier Sondre Norheim was buried in the cemetery in 1897.
Document 7: Alcohol laws of New York: In response to the National Minimum Drinking Age Act in 1984, which reduced by up to 10% the federal highway funding of any state which did not have a minimum purchasing age of 21, the New York Legislature raised the drinking age from 19 to 21, effective December 1, 1985. (The drinking age had been 18 for many years before the first raise in 1984, to 19.) Persons under 21 are prohibited from purchasing alcohol or possessing alcohol with the intent to consume, unless the alcohol was given to that person by their parent or legal guardian. There is no law prohibiting where people under 21 may possess or consume alcohol that was given to them by their parents. Persons under 21 are prohibited from having a blood alcohol level of 0.02% or higher while driving.
Document 8: Alcohol laws of Wisconsin: The 1983 Wisconsin Act 74, effective July 1, 1984, created a drinking age of 19. Meeting in special session at the call of the governor, the legislature enacted 1985 Wisconsin Act 337, which raised the drinking age to 21 and brought the state into compliance with the NMDA (National Minimum Drinking Age) on September 1, 1986.
Document 9: Alcohol laws of Wisconsin: The drinking age in Wisconsin is 21. Those under the legal drinking age may be served, possess, or consume alcohol if they are with a parent, legal guardian, or spouse who is of legal drinking age. Those age 18 - 20 may also be served, possess or consume alcohol if they are with a parent, legal guardian, or spouse who is of legal drinking age. Those age 18 to 20 may also possess (but not consume) alcohol as part of their employment.
Document 10: National Minimum Drinking Age Act: The National Minimum Drinking Age Act of 1984 (23 U.S.C. § 158) was passed by the United States Congress on July 17, 1984. It was a controversial bill that punished every state that allowed persons below 21 years to purchase and publicly possess alcoholic beverages by reducing its annual federal highway apportionment by 10 percent. The law was later amended, lowering the penalty to 8 percent from fiscal year 2012 and beyond.
Document 11: Song of the Pines: " Song of the Pines" (Philadelphia, PA: John C. Winston Company; first edition. 1949) was part of the "Land of the Free" series of children's books. The book highlighted the contribution of Norwegian immigrants to the Wisconsin logging industry. The book focuses on the story of a 15-year-old orphan named Nils who emigrates to America in the 1850s. Nils is a trained knife sharpener who sets up a business making cant hooks, a traditional logging tool. The novel was edited by Erick Berry and illustrated by the artist Richard Floethe (1901-1988). First published in 1949, it became a Newbery Honor recipient in 1950.
Document 12: My Ántonia: The novel tells the stories of an orphaned boy from Virginia, Jim Burden, and the elder daughter in a family of Bohemian immigrants, Ántonia Shimerda, who are each brought as children to be pioneers in Nebraska towards the end of the 19th century. Both the pioneers who first break the prairie sod for farming, as well as of the harsh but fertile land itself, feature in this American novel. The first year in the very new place leaves strong impressions in both children, affecting them lifelong.
Document 13: Bernhard Pauss: He was headmaster and owner of Nissen's Girls' School (1872–1907/1903) and head of its affiliated women's teachers college, the first higher education institution open to women in Norway. He was also a lecturer at the Norwegian Military Academy. He was chairman of the Norwegian Santal Mission (1887–1907), in succession to Oscar Nissen, and the first editor-in-chief of its journal "Santalen". He also wrote and edited several schoolbooks in Norwegian and German, including the reading book series "Læsebog i Modersmaalet", that was one of the most widely used schoolbooks in Norway for over half a century. A village in India, Pauspur (Pausspur), was named in his honour. He was a member of the government-appointed committee which proposed the Higher School Act, adopted in 1896.
Document 14: Nansen Ski Club: In the early 1920s the name was changed to Nansen Ski Club in honor of the explorer Fridtjof Nansen (1861–1930). The club soon built a small ski jump in an area of town called Paine's Pastures. In 1936, the jump was too small and was falling into disrepair, and in 1937, with the help of the National Youth Administration, the new Nansen Ski Jump was constructed on the Berlin/Milan border. The "Big Nansen" was the tallest jump in the United States at that time, and in 1938 the first Olympic trials were held here. Although the ski jump closed in 1988, the club still remains to this day.
Document 15: U.S. history of alcohol minimum purchase age by state: From 1976 to 1983, several states voluntarily raised their purchase ages to 19 (or, less commonly, 20 or 21), in part to combat drunk driving fatalities. In 1984, Congress passed the National Minimum Drinking Age Act, which required states to raise their ages for purchase and public possession to 21 by October 1986 or lose 10% of their federal highway funds. By mid-1988, all 50 states and the District of Columbia had raised their purchase ages to 21 (but not Puerto Rico, Guam, or the Virgin Islands, see Additional Notes below). South Dakota and Wyoming were the final two states to comply with the age 21 mandate. The current drinking age of 21 remains a point of contention among many Americans, because of it being higher than the age of majority (18 in most states) and higher than the drinking ages of most other countries. The National Minimum Drinking Age Act is also seen as a congressional sidestep of the tenth amendment. Although debates have not been highly publicized, a few states have proposed legislation to lower their drinking age, while Guam has raised its drinking age to 21 in July 2010.
ground_truth: September 1, 1986
sub_queries: Song of the Pines >> narrative location Answer: Wisconsin
when did the drinking age change to 21 in Wisconsin Answer: September 1, 1986