Go back and sink Columbus, Europeans will assume they were correct about the massive ocean to the West being too big and dangerous to sail across and ignore that direction for a while longer. No Conquistadors is a huge win for South and Mesoamerica.
If you really want to reshape the history of the New World you’ve gotta go back like 12,000 years and convince people to capture and train animals like the camelops and American horse instead of simply hunting them. European diseases were so devastating in large part because New World peoples did not have a comparable livestock culture (that being a major source of disease).
Go back and sink Columbus, Europeans will assume they were correct about the massive ocean to the West being too big and dangerous to sail across and ignore that direction for a while longer. No Conquistadors is a huge win for South and Mesoamerica.
If you really want to reshape the history of the New World you’ve gotta go back like 12,000 years and convince people to capture and train animals like the camelops and American horse instead of simply hunting them. European diseases were so devastating in large part because New World peoples did not have a comparable livestock culture (that being a major source of disease).