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The Manhattan Project was concerted effort by the United States, in collaboration with the United Kingdom and Canada, to build the first atomic bomb. The project was lead by J. Robert Oppenheimer and headed by General Leslie Groves.
Scientists including Albert Einstein, Enrico Fermi and Leo Szilard also participated in the Manhattan Project. The first test bomb was dropped on July 16, 1945.

Manhattan Project - Wikipedia

en.wikipedia.org/wiki/Manhattan_Project

The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States ...

The Manhattan Project [ushistory.org]

www.ushistory.org/us/51f.asp

Early in 1939, the world's scientific community discovered that German physicists had learned the secrets of splitting a uranium atom. Fears soon spread over ...

The Manhattan Project - American Museum of Natural History

www.amnh.org/exhibitions/einstein/peace-and-war/the-manhattan-project/

In July 1940, the U.S. Army Intelligence office denied Einstein the security clearance needed to work on the Manhattan Project. The hundreds of scientists on the ...

Manhattan Project | United States history | Britannica.com

www.britannica.com/event/Manhattan-Project

Apr 17, 2015 ... Leslie R. Groves was placed in charge of all Army activities (chiefly engineering activities) relating to the project. “Manhattan Project” became ...

The Manhattan Project: Making the Atomic Bomb | History of the ...

www.atomicarchive.com/History/mp/

The Manhattan Project: Making the Atomic Bomb is a short history of the origins and development of the American atomic bomb program during World War II.

Manhattan Project National Historical Park (U.S. National Park ...

www.nps.gov/mapr/

New free mobile app allows users to take virtual tour of Project-Y of Manhattan Project NHP at Los Alamos. An Interpretive Planning Workshop Scholars' Forum.

Manhattan Project - Nuclear Files

www.nuclearfiles.org/menu/key-issues/nuclear-weapons/history/pre-cold-war/manhattan-project/

Manhattan Project. The Manhattan Project was a secret military project created in 1942 to produce the first US nuclear weapon. Fears that Nazi Germany would ...

Manhattan Project Voices |

www.manhattanprojectvoices.org/

"Voices of the Manhattan Project" is a joint project by the Atomic Heritage Foundation and the Los Alamos Historical Society to create a public archive of our oral ...

Manhattan Project Video - The Trinity Test - HISTORY.com

www.history.com/topics/world-war-ii/trinity-test/videos/manhattan-project

Explore the top-secret American project to build the world's first atomic bomb.