I agree with sisley. For example, I guessed barbary war, but not first barbary war. That's getting awfully specific. Similarly, I guessed mexican war, but not mexican-american war.
I second everything that's been said so far, I also think you should accept shorter versions such as just "Iraq" "Afghanistan" or "1812". It's hard to know whether it should be "War of X" or "X-ian War" or something similar. I think the "war" is kinda implied, so quizzes like this normally accept the names without that part. You need to change the spelling of AfgHanistan as soon as possible too. Interesting quiz otherwise :)