Churchill's Bomb: How The United States Overtoo... May 2026

As the war progressed, the sheer cost and vulnerability of building massive enrichment plants in the UK became prohibitive due to German bombing. In 1943, Churchill and Roosevelt signed the , which integrated British scientists into the American "Manhattan Project." However, this partnership was never truly equal:

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 Churchill's Bomb: How the United States Overtoo...

As the project neared success, the U.S. began to restrict British access to key data, fearing post-war commercial competition and Soviet espionage. The Post-War Freeze: The McMahon Act As the war progressed, the sheer cost and