Why did Columbus and other colonists during the colonial period spread European deseise throughout the native Americans while the Vikings, who discovered America earlier, did not?

by [deleted]
Searocksandtrees

Hi! This is one of the most popular questions in this sub - check out a few previous posts on this that are archived in the FAQ*

http://www.reddit.com/r/AskHistorians/wiki/nativeamerican#wiki_native_americans_and_.28european.29_diseases

*see the link on the sidebar or the wiki tab