Dear Log,
«As Smith describes it, in the US and Britain, "sandwich" came to describe both a rough-hewn bar snack and a dainty teatime dish of the kind described in 19th-century cookbooks. The upscale tradition largely died away in the US after the first world war, when the sandwich became established as a working-class standard, its ubiquity linked to the development of artificial preservatives, the recent appearance of commercial mayonnaise and, in 1928, the invention of the bread-slicing machine.»
