When the Europeans confronted the Aztecs and Incas in the 16th century, those people, despite their empires, had not discovered the wheel, much less any kind of more advanced technology. That's why they so easily collapsed. All that was done before Columbus sailed from Spain. And all of the above is far from a complete list of the accomplishments of the people of Asia, the Mediterranean and Europe. If I've overlooked one or two items, please let me know.
Multiculturalism is a political tactic but otherwise a load of horse apples.