Yes we were.
First of all we had illegally limited Japan's military size, forced all of the trade partners of Japan into bad deals, and then we cut off Japan from the iron, oil, coal, and food it needed.
As for December 7, 1941, it was the US that fired the first shots.
The USN Ward Destroyer sank a Japanese minisub early in the morning, many hours before the Japanese attack.
That means the claim it was a "sneak attack" was a lie.
We had decoded all the messages and knew exactly when and where, and deliberately allowed the attack to take place.