User blog comment:JakePT/Mass Effect 3 to be Revealed at VGA Awards?/@comment-216.40.154.60-20101130050458/@comment-730941-20101130063214

Huerta is the President of the United North American States, not the United Nations - Earth has no global government, all nation-states are still sovereign in their own territory. The Systems Alliance controls humanity's decisions outside Earth (perhaps outside the solar system) through its own Parliament.

As for the trailer, it could be anything at this stage, not even Mass Effect-related. We honestly will have to wait and see.