Has a Copa America game ever ended 9-1?
It has. 9-1 has been a Copa America final 4 times in 1,738 games. The first was Argentina beat Colombia on February 7, 1945; the latest was Brazil beat Ecuador on April 3, 1949.
That makes 9-1 the 23rd most common final score out of 36 that have ever occurred in Copa America. One point away, 10-1 has happened 2 times and 9-2 has happened 2 times. Nearly all of its occurrences fall between 1920 and 1949.