The Monroe Doctrine was an effort to stop Europeans from influencing politics within the United States. (Lets say if Russia tried to turn the U.S communist during the cold war. The Monroe Doctrine would take into effect)
Herjólfsson later sold his ships to Ericson, who sailed west intentionally and was not blown off course trying to reach Greenland after meeting King Olaf, as in the
Saga of Eric the Red
. With wood being in very short supply in Greenland, the settlers there were eager to explore the riches of this new land. Ericson explored this coast and eventually established a short-lived colony in what he called Vinland.
Hercales :)
(And yes, I do mean Hercales and not Hercules. Hercules is Roman, not Greek)