What if 1492 level technology native americans sailed to the

>>3136437
>And why didn't the native diseases kill 90% of visiting europeans, why did it happen the other way around?
Syphilis works slowly

>>3136437
>And why didn't the native diseases kill 90% of visiting europeans, why did it happen the other way around?

Syphilis is sexually transmitted. Small pox, influenza, etc, is airborne. As for Native Americans with similar technology invading Europe without disease being a factor, they'd have made zero headway. Their supply lines would have been nearly nonexistant, they wouldn't have known the land, and they would have had to tangle with a highly structured society used to organized warfare.

>>3136463
And if they invaded West Africa they'd have all died from Malaria. The very same thing happened to Europeans until the 1800s when sufficient medical advances were made to combat that disease.

>>3136437
>why didn't the native diseases kill 90% of visiting europeans, why did it happen the other way around?


Two reasons. One, most settlers lived seperately from the natives, not having much physical contact with them. Plagues like cocoliztli, which killed most of the Mexican Indians, spread in areas with large native populations (the Mexica highlands in this case) whereas the settlers usually lived in areas far away from the epicenters (the lowland coasts.)
Two, the natives were severely overworked by the Spanish, suffering brutal conditions by greedy colonial landowners and governors. This meant lots of stress, which in turn meant weaker immune systems. Since many natives were forced into cramped conditions on plantations and in cities (often as slaves), plague could spread rapidly through people as well as between them.

Natives didn't have a head start, suffered from a relatively recent genetic bottleneck, and didn't domesticate as many animals as Euros did. Lack of proximity to animals that were farmed to be eaten limited exposure to potentially infectious diseases, which led to the lack of a development of a prolific immune system through natural selection, leaving them more susceptible to old world diseases than the other way around. To see an old world example of this, check out how many indigenous siberians died from exposure from euro diseases when they came into contact with the ruskies