The bagel came into more general use throughout North America in the last quarter of the 20th century with automation. Daniel Thompson started work on the first commercially viable bagel machine in 1958; bagel baker Harry Lender, his son, Murray Lender, and Florence Sender leased this technology and pioneered automated production and distribution of frozen bagels in the 1960s. Murray also invented pre-slicing the bagel.
when did bagels become popular in the us
in the last quarter of the 20th century