The Destro is correct; from the Information Index:
QUOTE
Manhattan Project - $100,000,000 - The Manhattan Project allows nations below 5% of the top nations in the game to develop nuclear weapons. The Manhattan Project cannot be destroyed once it is created. The wonder requires 3,000 infrastructure, 300 technology, and a uranium resource.
Emphasis mine. The only thing your nation lacks is the uranium resource, which you will also need to purchase nuclear weapons. Question anwered, closing thread.