A History of Short Words

From the New York Times Crossword Puzzle

SAO

Sat, 20 Nov '21
Word in some South American city names
Wed, 14 Jul '21
Portuguese title with a tilde
Sun, 16 May '21
Start of many Portuguese place names
Thu, 29 Apr '21
___ Paulo
Wed, 24 Mar '21
___ Paulo
Thu, 11 Mar '21
Title with a tilde
Wed, 3 Feb '21
___ Tomé and Príncipe