A History of Short Words

From the New York Times Crossword Puzzle

OAS

Sun, 14 Jul '24
Intl. alliance that includes Canada and Costa Rica
Sun, 9 Jun '24
Western Hemisphere grp. since 1948
Sun, 29 Jan '23
Western Hemisphere treaty grp.
Sun, 27 Mar '22
Western Hemisphere grp.
Mon, 22 Nov '21
Grp. that extends from Canada to Chile
Wed, 2 Jun '21
Western treaty grp.
Sun, 17 Jan '21
Western Hemisphere grp.