In 1492 a Native American 'explorer' makes landfall in Europe/Africa. This explorer returns home with fruits, slaves, thus kickstarting a campaign to invade/colonize Eurasia+Africa
How would a Native American nation (or civilization) develop (technologically, culturually, and sociologically) from to achieve this historical event?
- Only North American Native American tribes and cultures are allowed. Incans, Mayans, and Aztecs will be the subject of other questions.
- I am interested in how a native american civilization could've developed to this point. The consequences afterwards of Native Americans invading Europe will be covered in a separate question.
- Feel free to implement Leif Erikson's journey however you like or not all. Leif Erikson may be ignored and left to the annals of history much like modern history, or become integral as in @Will's answer.
- Please use historical revisionism and science where possible.
- No Magic.
- Native Americans did not have horses.
- Native Americans domesticated animals (Llamas, Dogs, Bobcats, Turkeys) but did not have nearly as many available animals to domesticate as Europe, especially with regards to beasts of burden.
- Native Americans did have agriculture (corn and other fruits and vegetables) and were familiar with farming techniques.
- The Americas were and are rich in resources such as food, minerals, animals, etc.
- With respect to pathogens, Native Americans would still remain vulnerable to many European diseases. That said, if someone were to explain how Native Americans could domesticate animals to an industrial degree, 'America Pox' would be game.
EDIT: Since the original question was too broad, I've limited the scope of North American Native Americans and the development of a civilization to the age of exploration only.
EDIT 2: To address JBH's comment: I am aware of literature that posits why native americans did not develop as fast as Eurasians. That said, there is little literature that explains how native americans could have developed faster than Eurasians. With respect to World Building, if we assume it were possible, how then could native americans develop in such a manner. That is the underlying subject I'm looking to answer (via worldbuilding). Since this is a science based question, I do expect some science to be used, but citations are not neccesary.