Are homo sapiens the only species that organizes themselves into tribes and work towards the destruction of other tribes of same species?

Not even close. Territorial disputes are incredibly common in nature. Humans are relatively rare in that we're capable of understanding that depriving competitors of resources will eventually lead to their deaths, but that is the ultimate result of winning a territory dispute in nature too.

No, Chimpanzees also have tribes and fight over territory

https://en.wikipedia.org/wiki/Gombe_Chimpanzee_War

That is how some people make a lot of money.

Weaver ants