bayportWhy are barns in the United States often red?
dick_stitchesFarmers originally used to seal their barns with a combination of linseed oil (red-ish) and iron oxide (rust, red). Then when paint came around, apparently red paint was the cheapest. bobvila.com/…/solved-why-are-barns-painted-red/
Basically also why Swedish barns are red. I presume those two stories and red barn origins are related.
theodeweresure, lots and lots of Swedes came to the States in the 19th Century.. they tended to settle the Northern States and build farms, like everyone else was doing..