A History of Short Words

From the New York Times Crossword Puzzle

THEEU

Sun, 30 Jul '23
What was exited during Brexit
Wed, 21 Jun '23
Grp. with a 12-star flag
Tue, 23 Aug '22
Bloc that no longer includes Great Britain, for short
Thu, 9 Jun '22
What Britain left in 2020, in brief
Thu, 21 Apr '22
Grp. established by 1992's Maastricht Treaty