Human tribes branched before recorded history and pursued different rates of technological advancement. Thus, invasions from more technologically advanced "alie

Human tribes branched before recorded history and pursued different rates of technological advancement. Thus, invasions from more technologically advanced "alien" branches of life have been happening for all of recorded history. The last one I can think of was a mere 225 years ago (Hawai'i). It's foolish to expect history to not repeat.