Okay, dude. No offense, but you obviously don't know what you're talking about. Three things:
*Newton indeed stated the universe was entirely deterministic. Theoretically, if you knew about every tiny piece of matter and energy in the universe, and had a big enough computer, you'd be able to flawlessly predict the future. However, there is NO way to know every piece of the universe because a)observing something changes it, however minutely (and my next point shows why even a minute change can have huge effects) and

the computer needed to store and process this information would have to be larger and more complex than the universe itself. You can't comprehend a larger system with a smaller one.
*Chaos theory. Any iterative system, ie, the world, compounds ANY error in the initial data increasingly. Even an incredibly tiny change can have a huge effect. If you were to place weather sensors on every square meter of the planet, and had a computer model to predict weather from that data, it'd be spot on... if it was measuring just a short while ahead. However, its predictions would become useless over time because the differences in between those sensors would throw off the system a little bit, at first, and then a WHOLE lot.
*We aren't talking about newtonian physics. The world is NOT strictly deterministic according to quantum theory (the prime reason that Einstein rejected it). Quantum mechanics has a whole lot of crazy stuff with probability... Neils Bohr, it's creator, famously said "If you think you understand quantum physics, you don't understand quantum physics".
Even if that probabilistic model ultimately ends up to have deterministic underpinnings, do you really think a system that complex could be modelled to any reasonable scale? Merely simulating a single living cell is something that we haven't managed to do, and even that simulation would require a lot of abstraction unless you wanted to also simulate the quarks, gluons, and other sub-sub-atomic particles. And there's probably a level below that, too...
So, for all practical purposes, physics is not certain or predictable and never will be. Arguing otherwise betrays a lack of knowledge of advanced physics.
And, finally, your deal with the ethical question: no, we wouldn't know the results. Maybe the US government would destroy itself to stop such a move, maybe the middle east would end up fighting viciously and turning the tables, maybe the rest of the world, the US's allies included, would move to counter it. And those are just SOME of the BIG possibilities. Can you predict which streets the president would be burned in effigy? Which fights the USMC would win or lose, and by how much? Which words would come from the tongue of a diplomat? How would those words be inflected? Would someone take offense? Would the translators mistranslate a crucial word?
Make all the predictions you want, you have no guarantees of accuracy. If you think you can predict all of that, then I would busy yourself with pyschiatric treatment, because its not possible.