A History of Short Words

From the New York Times Crossword Puzzle

BSA

Sat, 14 Dec '24
Grp. whose first letter is now outdated
Tue, 8 Mar '22
Grp. that welcomed girl Cubs in 2018
Thu, 20 May '21
Scouts ___, rebranded name since '19
Fri, 12 Feb '21
Eagles' org.