You've open a can of worms...Some say that there is evidence that they here and have colonies. Peruvian mountain ranges, and under water.
And the thing is, they are soo advance they could come at anytime. I just think they will wait till we fuck ourselves up and finish the job. Less time and effort. And there will be no negotiations. I think if this doesn't happen like that, but happens as a invasion, humanity has one chance to pull together for the first time and not concentrate on race, religion, ethniticity, gender and focus on survival. Fuck the race war shit...