[77pt77]

The new population would have had immunity when the europeans arrived and they didn't.

You write way too much for too little information.

[maxglute]

Only if spread continental scale which implies prolonged exchange. Otherwise can be isolated to small cohort. You claim there would be 10% population in prior disease exchange. You claim it's not debatable. I use too much words demonstrate otherwise. You seem to agree. Useful information was exchanged.