Hello! could you me ere'? which of these did president roosevelt do because of the attack on pearl harbor in 1941? a) he ordered the united states to attack france. b) he ordered the united states to join world war ii. c) he ordered the united states to attack great britain. d) he ordered the united states to join the vietnam war. in what way was truman's decision to use the atomic bomb most influenced by his predecessor, franklin d. roosevelt? a) roosevelt promised victory by unconditional surrender. b) roosevelt publicly endorsed the use of nuclear weapons. c) roosevelt vowed to get revenge for the pearl harbor attack. d) roosevelt declared that japan would be defeated at all costs.