Europeans introduced domestic animals such as chickens from Europe and Africa. European pigs, cattle and horses spread through North America, Indians learned to ride them.
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1- they didn't know the Americas existed 2- they thought the climate and topography were the same
Portugal and Spain
make a listevaluate influences
his voyages started a vast cultural exchange between the two hemisphere
I'd go with France and Spain, the two European nations with the power and desire to continue colonizing the Americas. Ironically, the U.S. didn't have the naval power to enforce the Monroe Doctrine at the time in was enacted and was relying on Britain to do it for them--and Britain did, because they didn't want France or Spain to gain any more power.