Answer: The Manhattan Project was the code name for the American-led effort to develop a functional atomic weapon during World War II.
Explanation: The Manhattan Project was the American program for researching and developing the first atomic bombs. The weapons produced were based solely upon the principles of nuclear fission of uranium 235 and plutonium 239, chain reactions liberating immense amounts of destructive heat energy.
It was the "Warsaw Pact" that was dedicated to the security of communist nations in Europe during the Cold War, since this arose mostly as a reaction to the emergence of NATO.
