Pre-Meiji Japan was a large functioning literate sedentary agricultural civilization with a high average IQ. North American Indians were nearly all hunter-gatherers or pastoralists, did not have a tradition of literacy, had low population densities, and probably had a lower average IQ.
The Japanese had a big head start.
North American Indians were nearly all hunter-gatherers or pastoralists...
Not exactly. There were plenty of hunter-gatherers, but both the Great Basin area and the American East and Southeast hosted fairly well-developed sedentary agricultural civilizations until European contact. Both had been under climate stress at the time of contact with the Spanish, and the latter collapsed with the introduction of European diseases, but the descendants of both remained largely agricultural. Populations did crash pretty hard, though.
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