Final answer:
The federally funded top-secret atomic bomb program established by Roosevelt in 1939 was called the Manhattan Project.
Step-by-step explanation:
The federally funded top-secret atomic bomb program established by Roosevelt in 1939 was called the Manhattan Project. It was a research and development program that produced the first atomic bombs during World War II. The project involved scientists from various disciplines, such as physics and chemistry, and it took place in multiple locations across the United States.
Learn more about the Manhattan Project