A little history

I knew some of this, but not all of it. I knew that the LDS Church was the BSA's first chartered organization, but I didn't know it was at the invitation of the BSA.
(This is from the brand new training aimed specifically at LDS Wolf and Bear Den Leaders):

In 1875, Brigham Young organized the Young Men Mutual Improvement Association (YMMIA or MIA) to provide leisure-time activities for the young men of the Church. Later, athletics became part of the program.

As news of the organization of the Boy Scouts of England in 1907 and the Boy Scouts of America in 1910 was received by the Church leaders, the Scouting idea was investigated by the Athletic Committee of the YMMIA. On November 29, 1911, the MIA Scouts were officially recognized by the General Board of the YMMIA. The MIA Scouts, upon invitation from the BSA National Council, became a part of the Boy Scouts of America on May 21, 1913. This is the BSA’s longest formal partnership with a national chartered organization.