Question: Mankiller is a 2017 documentary film directed by Valerie Red-Horse Mohl, concerning the life of Wilma Mankiller, was a community organizer and the first woman elected to serve as chief of which organization?

Context paragraphs:
Edna Beard: Edna Louisa Beard (July 25, 1877 – September 18, 1928) was the first woman legislator in Vermont; she was the first woman elected to the Vermont House of Representatives, and the first woman elected to the Vermont Senate.

Louise McKinney: Louise McKinney née Crummy (22 September 186810 July 1931) was a Canadian politician and women's rights activist from Alberta, Canada.  She was the first woman sworn into the Legislative Assembly of Alberta and the first woman elected to a legislature in the British Empire.  She served in the Alberta legislature from 1917 to 1921 as a member of the Non-Partisan League.  Later she was one of the Famous Five who campaigned successfully for the right of Canadian women to be appointed to the Senate.  A former schoolteacher and temperance organizer, she came to Alberta in 1903 as a homesteader.

Marie-Claire Kirkland: Marie-Claire Kirkland-Casgrain, {'1': ", '2': ", '3': ", '4': "} (September 8, 1924 – March 24, 2016) was a Quebec lawyer, judge and politician.  She was the first woman elected to the Legislative Assembly of Quebec, the first woman appointed a Cabinet minister in Quebec, the first woman appointed acting premier, and the first woman judge to serve in the Quebec Provincial Court.

Frankie Sue Del Papa: Frankie Sue Del Papa (born September 21, 1949) is an American attorney and politician in the U.S. state of Nevada; she is associated with the Democratic Party.  Del Papa was the first woman elected as Secretary of State of Nevada (1986) and the first woman elected as Nevada Attorney General (1990, 1994, and 1998).  In addition, Del Papa was the first woman elected student body president at the University of Nevada.

Barbara Roberts: Barbara Kay Roberts (born December 21, 1936) is an American politician from the state of Oregon.  A native of the state, she served as the 34th Governor of Oregon from 1991 to 1995.  She was the first woman to serve as Oregon governor, and the only woman elected to that office until 2016.  A Democrat, Roberts was also the first woman to serve as majority leader in the Oregon House of Representatives.  She also won two terms as Oregon Secretary of State, and served in local and county government in Portland.  Roberts was married to Oregon state Sen. Frank L. Roberts from 1974 until his death in 1993.  From February 2011 until January 2013, she served on the council of Metro, the regional government in the Portland metropolitan area.

Julia Addington: Julia C. Addington (June 13, 1829 – September 21, 1875) was an American elected official in Iowa.  She was the first woman elected to public office in Iowa and may have been the first woman elected to public office in the United States.

Wilma Mankiller: Wilma Pearl Mankiller (November 18, 1945 – April 6, 2010) was a community organizer and the first woman elected to serve as chief of the Cherokee Nation.  A liberal member of the Democratic Party, she served as principal chief for ten years from 1985 to 1995.  She was the author of a national-bestselling autobiography, "Mankiller: A Chief and Her People" and co-authored "Every Day Is a Good Day: Reflections by Contemporary Indigenous Women".  Mankiller's administration founded the Cherokee Nation Community Development Department and saw a population increase of Cherokee Nation citizens from 55,000 to 156,000.

Martha Griffiths: Martha Wright Griffiths (January 29, 1912 – April 22, 2003) was an American lawyer and judge before being elected to the United States House of Representatives in 1954.  Griffiths was the first woman to serve on the House Committee on Ways and Means and the first woman elected to the United States Congress from Michigan as a member of the Democratic Party.  She was also the person "instrumental" in including the prohibition of sex discrimination under Title VII in the Civil Rights Act of 1964.  In 1982, Griffiths was also the first female "elected" as Lieutenant Governor of Michigan.  (Matilda Dodge Wilson had been "appointed" the first female Lieutenant Governor of Michigan in 1939).

Czarina Conlan: Czarina Conlan (1871-1958) was a Choctaw-Chickasaw archivist, who curated at the Oklahoma Historical Society museum for 24 years.  She founded the first woman's club in Indian Territory and served as the chair of the Oklahoma Indian Welfare Committee of the Oklahoma State Federation of Women's Clubs for 12 years.  She was the first woman elected to serve on a school board in the state and though the Attorney General of Oklahoma ruled she could not serve, she defied the order and completed a two-year term on the Lindsay School Board.  In 1928, she was appointed by an assembly of 400-500 Choctaw and Chickasaw tribe members from throughout Oklahoma to chair their convention and then to represent their interests in Washington, D.C. on the pending coal and asphalt resources bill.  It was the first time a woman had been sent from either tribe as a representative for their tribe in Washington.  She was inducted into the Oklahoma Hall of Fame in 1935.

Mankiller (film): Mankiller is a 2017 documentary film directed by Valerie Red-Horse Mohl and executive produced by Gale Anne Hurd, concerning the life of Wilma Mankiller.  The film had its US premiere on June 19, 2017 at the Los Angeles Film Festival.  It was produced by Red-Horse Native Productions and Valhalla Entertainment and is a presentation of Vision Maker Media for PBS.

Supporting paragraphs: Mankiller (film) Wilma Mankiller
Answer: Cherokee Nation