The Bubonic Plague OTL reached Norway in the late summer of 1349. At this time, the King of Norway held domains in Greenland and Iceland. OTL, the Black Plague did not reach Iceland until 1402-1404 and it is debated whether or not it reached the Norse settlements in Greenland. What if, as a point of divergence, a ship full of goods leaves the port of Bergen in 1349 to collect walrus tusk and taxes from the Norsemen in Greenland. Let's say they unknowingly carry some little rodent stowaways and when the ship lands in Greenland, these rats infect the local population with the Bubonic Plague and the disease is then transmitted to the Inuits via trade. Inuits in Greenland spread the plague to other Arctic peoples in North America, and from there it ravages its way through the continent(s). What would the long-term effects be? Would the civilizations of the Mississippi, Mesoamerica, and South America collapse, or would their immune systems be strengthened? Would 1492 go differently?