Why do aufiences in America traditionally rise for the hallelujah chorus in handels messiah?

Audiences in America traditionally rise for the "Hallelujah Chorus" in Handel's Messiah as a sign of respect and reverence. This custom is believed to have originated from the story that King George II stood during the performance, prompting the audience to follow suit. The chorus celebrates the triumph of Christ and evokes a powerful emotional response, making it a fitting moment for such a gesture. Rising during this piece has become a cherished tradition in concert performances.