This is a proposal, I am in no way ready to run this. I am an experienced GM but it will be some time before I am ready to run it. I've never run a rorum game before.. I'm about to play in a couple, and will make a decision then as to whether I'm up to this.
There have been a number of Invasion movies in the theaters lately. They follow the same pattern: Big Bad Uglies from space descend on our world and take a real good shot at annihilating humanity. I have in mind something a little more complicated. The first batch of aliens to find us don't want to wipe us out. We are not a threat to them, they don't really give a damn how we treat the ecosphere, they are not murderous psychopaths. They do look human, though. Human enough to really creep out our scientists. It should not be that way, nosirree bob.
They want to make money.
How? Spices. Coffee. Tea. This "chocolate" stuff that alien women go absolutely nuts over. Funny thing about money making ventures. They attract attention. First from competitors, then from tax collectors. There is an old saying: Trade follows the Flag. Not exactly true. It would be more accurate to say: The Flag follows Trade. Wild and wooly cutthroat - sometimes literally - competition can be very destabilizing. Governments hate destabilization. They tend to move in, set up regulations and spheres of influence, calm things down. Sound familiar? It should. That's more or less what happened to the East Indies, India, China, SE Asia. And Africa.
And some people think it might be about to happen to earth as a whole.