They made INSANE jumps in tech over the last 20 years.  They got a moonbase and hover-jets and sh*t.  Though I wonder how much of that has trickled down to the rest of the world.  We know the planet is united, but realistically, after the massive destruction and death in the original movie, you gotta figure that the environment is wrecked, that there's massive waves of migrants, unemployment, health crises... we have to have become a third world planet after that.  Even if the military has advanced tech, what's happening to the regular people on the ground?