Humans (sapiens) are very altruistic to their in-group and downright brutal to their out-group. The easiest trick may just be to adjust these boundaries over ti

Humans (sapiens) are very altruistic to their in-group and downright brutal to their out-group. The easiest trick may just be to adjust these boundaries over time. If sentient aliens showed up to wage war, I'm sure the different human nations on earth would suddenly find themselves to have a lot more in common.