You missed a contradiction. Not only did Nephi find things in the new world we know were brought over by Europeans later, but he also found OXEN, which had somehow been naturally castrated. Note Nephi didn't find any bulls.
Quote:
18:25 And it came to pass that we did find upon the land of promise, as we journeyed in the wilderness, that there were beasts in the forests of every kind, both the cow and the ox, and the ass and the horse, and the goat and the wild goat, and all manner of wild animals, which were for the use of men. And we did find all manner of ore, both of gold, and of silver, and of cop
