In the early years of the war (1940–1941), the United Kingdom was actually the world leader in nuclear research. While the U.S. was still skeptical, British scientists—bolstered by refugees from Nazi Europe like Otto Frisch and Rudolf Peierls—proved that a "super-bomb" using U-235 was theoretically possible. This research was codified in the , which Churchill shared with President Roosevelt, essentially jump-starting the American effort. The Quebec Agreement and the Shift in Power
The U.S. invested billions of dollars and built entire cities (like Oak Ridge and Los Alamos), while Britain could only provide scientific "brainpower." Churchill's Bomb: How the United States Overtoo...
The ultimate "overtaking" occurred in 1946 with the passage of the . This U.S. law cut off all international cooperation on nuclear energy, effectively locking Britain out of the very project it helped start. Churchill felt betrayed, as he believed the "Special Relationship" guaranteed Britain a seat at the nuclear table. The Result: An Independent Deterrent In the early years of the war (1940–1941),
Left out in the cold, the British government decided they could not afford to be a second-tier power. In 1947, they began their own independent program, eventually detonating their first atomic device in 1952. By then, however, the United States had already moved on to the Hydrogen Bomb, cementing its status as the world’s lone nuclear superpower for a time. This research was codified in the , which
