Question: When did they change the name of mount mckinley to denali?

Disambiguated questions and answers:
context: The mountain was always commonly referred to by its Koyukon Athabaskan name "Denali", especially by Alaskans, mountaineers, and Alaska Natives. In 1975, the Alaska Board of Geographic Names changed the name of the mountain to Denali, and, at Governor Jay Hammond's behest, the Alaska Legislature officially requested that the United States Board on Geographic Names (BGN), the federal governmental body responsible for naming geographic features in the United States, change the name of the mountain from "Mount McKinley" to "Mount Denali".
question: When did the Alaska Board of Geographic Names change the name of Mount McKinley to Denali?
short_answers: 1975
wikipage: Denali–Mount McKinley naming dispute
context: On August 30, 2015, Sally Jewell announced that the mountain would be renamed Denali, under authority of federal law which permits her as Secretary of the Interior to name geographic features if the Board of Geographic Names does not act within a "reasonable" period of time. In media interviews, Jewell cited the board's failure to act on the state's four-decade-old request, saying "I think any of us would think that 40 years is an unreasonable amount of time."
question: When did the Secretary of the Interior change the name of Mount McKinley to Denali?
short_answers: August 30, 2015
wikipage: Denali–Mount McKinley naming dispute

Long-form answers:
knowledge: content: The name of the highest mountain in North America became a subject of dispute in 1975, when the Alaska Legislature asked the U.S. federal government to officially change its name from "Mount McKinley" to "Denali".
wikipage: Denali–Mount McKinley naming dispute
content: Attempts by the Alaskan state government to have Mount McKinley's name changed by the federal government were blocked by members of the congressional delegation from Ohio, the home state of the mountain's presidential namesake. In August 2015, Secretary of the Interior Sally Jewell announced that the name would officially be changed in all federal documents.[4][5] While on an Alaskan visit in the first week of September 2015, President Barack Obama announced the renaming of the mountain
wikipage: Denali–Mount McKinley naming dispute
long_answer: The name of the highest mountain in North America became a subject of dispute in 1975 when the Alaska Legislature asked the U.S. federal government to officially change its name from Mount McKinley to Denali. Attempts by the Alaskan state government to have Mount McKinley's name changed by the federal government were blocked by members of the congressional delegation from Ohio, the home state of the mountain's presidential namesake. However, on August 30, 2015, Sally Jewell announced that the mountain would be renamed Denali, under authority of federal law which permits her as Secretary of the Interior to name geographic features if the Board of Geographic Names does not act within a reasonable period of time. In media interviews, Jewell cited the board's failure to act on the state's four-decade-old request, saying "I think any of us would think that 40 years is an unreasonable amount of time." Then, while on an Alaskan visit in the first week of September 2015, President Barack Obama announced the renaming of the mountain.