"Despite Their Extensive Raids And Pillaging Across Europe, The Vikings Encountered Difficulties In Subduing A Group Of People They Referred To As The "Wretched People" Or Skraelings In North America. In An Intriguing Discovery, Archaeologists Unearthed Native American Arrowheads Buried Alongside The Remains Of Norse Individuals In A Viking Settlement In Newfoundland, Canada. This Finding Has LED To The Theory That The Native American Population Successfully Repelled The Viking Invaders, Forcing Them To Abandon Their Endeavors In North America, Never To Return"
Given all the historical evidence available, empirical and anecdotal, it is, and always will be, the most logical conclusion.
me- "Oooh, right. The walls. The walls for Kuzco. The walls chosen specially to protect Kuzco. Kuzco's walls.... Those walls?"
Also, dinosaurs existed all over the planet and when people discovered the fossils, they had no idea what they were. This explains why mythical creature legends (like dragons) exist in almost every ancient culture.