Before January 21, 2009, the United States attacks Iran. For this claim to be judged true, U.S. military forces must engage Iranian targets at the direction of the U.S. President.
Some events that would satisfy this claim:
Note that the U.S. President must specifically premeditate and order this operation. An automatic response by U.S. forces to an Iranian action in a single incident would not constitute sufficient conditions for this claim to be judged TRUE.
Some events that would NOT satisfy this claim:
Iran is one of three nations comprising the "axis of evil". The other two are Iraq and North Korea. The United States launched a military attack on Iraq on March 19, 2003.
If there is any ambiguity, I will judge this claim by the intent of the claim.