Humans are tribal on a surface level - color, language, affiliation etc. With a hostile external enemy it will force humanity to work as a collective to make strides in technology and innovation. Internet came from DoD/DARPA. Nukes came from DoD. Space flight came from NASA - all in time of WAR. The Tribe is Humanity. Period. Until we work together we will spiral into war and stupidity. Like we have since the first ape slew another for access to females and food. We are BETTER than this.