What sea going vessel was not present on the day of the attack that later proved to be the most important in the fight against the Japanese?

The Pacific Fleet Aircraft Carriers

Explanation: They were not at Pearl Harbor when the Japanese attacked and as a result they ended up being the centerpiece for the war.  The aircraft carriers were in some ways more important than the battleships.

they usually pass federal laws

and sometimes in the elections of the president

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.