What 2 events led to a major population decrease in the european middle ages?

What led to the growth of Europe's population in the Middle Ages? Farmers were able to feed more people and trade increased. ... The Vikings raided Britain, Ireland, and other parts of western Europe.

in which two ways were the northeast woodland indians and the southeast indians similar? both collaborated to form the iroquois confederacy. both cultivated the crops of corn, beans, and squash. both lived in rich environments of swamps and rivers. both lived in tree-bark dwellings called wigwams. both expected men to hunt, while women farmed.