Why Neanderthals Died Off
Why Neanderthals Died Off
Meeting Each Other
Meeting Each Other
Your Specific Question
Your Specific Question
But let's say that some Neanderthals did not starve out, and met up with homo sapiens only a few thousand years later. TheyWould they both posses similar levels of technology? It's unlikely - look at Europeans vs Native Americans. That would give one side an advantage.
Genocide
One species would kill the other off, with my money being placed on homo sapiens - our ancestors were simply smarter.
Possible Cohabitation?
In my opinion this is highly unlikely, but here goes.
The cultural, and technological level of each race will matter immensely in this situation. The more barbaric, the less chance of them getting along.
For the two species to co-exist (which I am defining as one species not actively trying to stomp the other one out of existence) a few key conditions would have to be met:
1. Territories don't overlap
If one group is pushing into the other group's territory looking for resources then they're bound to come to blows. This has been the most basic reason human beings have killed each other ever since we first climbed out of trees.
2. Language & Culture
If both groups have advanced to the point where they have a decently developed language then they are more likely to try and communicate.
3. Development Level
If at least one group has outgrown the hunter-gatherer stage then that might work in favor of cohabitation. Evolving communities probably means that the foundation for trading has been established, not just killing strangers on sight.
4. A Common Foe
This is very likely the only true way for Neanderthals and homo sapiens to end up allied in some way. Neanderthals are stronger than homo sapiens, while homo sapiens are craftier. If they face a danger which threatens both, then they may team up, as long as communication is possible.
Imagine a group of Neanderthals meeting a raged group of battle weary HS. Instead of killing one another on sight, the HS trade some tools for food. Intrigues by these fur clad, mysterious strangers the Neanderthals don't just kill them, but offer them shelter, etc.
What you have to do is imagine a scenario where the two groups have something to offer each other, such as the brawny Neanderthals helping the clever HS hunt some dangerous creatures, or the two groups helping each other survive some cataclysm. That's what bonds two radically different communities together. In the aftermath of these two communities getting along and forming one united front others may follow in their path.