Like most American cuisine that gravitated across the pond apart from KFC, McDonald's etc..
The Yanks made a hole in the middle of a sandwich to save money and gave it a fancy name to justify the price.
"The pairing of a Polish warrior king and a small Jewish bread roll is not only incongruous but is also entirely fictitious," Balinska writes, citing written evidence of the bagel's existence years earlier when Buffalo Bill's bullet went astray in a Seattle bakery.