Final answer:
The memo supports the statement that the U.S. had success in WWII due to its technological advancements.
Step-by-step explanation:
The memo from President Franklin D. Roosevelt to Vannevar Bush, scientist and director of the Office of Scientific Research and Development during WWII, supports the statement that the U.S. had success in WWII due to its technological advancements.
The memo discusses the need for a review of the work of the Office on New Weapons, indicating that the U.S. was actively developing new weapons and strategies. Additionally, the memo mentions the success of the Trinity Test, which refers to the successful detonation of the atomic bomb, showcasing the U.S.'s technological superiority.