[Mariner]

Prior to 1850 all bread was whole grain sourdough.

Just like I make it today.

It’s dense and unglamorous.

With incredible flavors.

[Liz]

Sourdough cinnamon rolls.

[Harmless Teddy Bear]

Prior to 1850 all bread was whole grain sourdough.

No... it wasn't.

Flours were milled and sifted finely to make unbleached white flour and brewers yeast was used to get a fine light bread since at least the medieval period.

Whole wheat bread was lower class and sourdough was mostly found in the Americas where there was not a bunch of brewers handy.