Let me start off by saying this: i have not played or bought COD: Ghosts and i never will. Modern Warfare 3 and Black Ops 2 was the end of Call Of Duty for me in terms of buying the games themselves(i still play them). With that said, i haven't seen the entire story, and feel free to correct me on anything.
1. America's defenses being "weakened".
So from what i've heard, the game starts off with an into that would imply that America's Military has been weakened or even crippled, yet apparently throughout the story America appears to have a huge arsenal of weapons at it's disposal, such as ships,missile launchers, Nukes, ETC. So where does the part where the army has been weakened come in?
2. Since when has South America been a threat to North America?
Alright this is beyond stupid, since WHEN has South America has the ability to attack North America OR hack into their computers? Why not choose someone who actually DOES have the power like China or maybe even Russia.
3. Taking away America's Orbital missile launcher
And Who in in the right mind thinks it's a good idea to give America an Orbital Missile Launcher Exactly? Even if South America hacked into it, they would do it to protect themselves from being shot by North America. You know what? South America should have an orbital Missile Launcher to use against the U.S. and stop it from blowing up the earth.
4. America using the Orbital Missile Launcher.
And this is why we can't have anything nice, now isn't it? America constructs a device that can kill thousands of people, South America hacks it to protect themselves (i would assume), and America regain control of it and kill Innocent people. Way to make America look like the bad guys eh?