[nllmamas] Larger tribes

The story goes, humans have evolved not to be able to function well in tribes of size larger than about 100.  Suppose we wish increase that number through eugenics: we argue that the ethical problems of eugenics are outweighed by the fact that this instinctive behavior is the root cause of tremendous conflict in the modern world and is drastically preventing the forward progress of the human civilization.  We will need to work in teams larger than 100 to build starships.

How would we do this?  What genes code for "tolerable tribe size"?

What would human society freed of tribalism look like?  Perhaps a Borg hive.

Perhaps the eugenics has already been done: a master can command more than 100 slaves.