The U.K. started looking into nuclear weapons in late 1940-early 1941. In 1947, Britain decided build its own nuclear weapons. U.S. National Test Site, Nevada. China officially decided to obtain nuclear weapons in 1955. Still conducting nuclear tests.
China is thought to have plans for at least four more nuclear tests.
Lop Nor test site in Xinjiang Province. India's Atomic Energy Commission was established in 1954. The existing nuclear program began to include a nuclear explosives program after China tested their first nuclear weapon in 1964. In 1970, officials started stating publicly that India was looking into the possibility of using nuclear weapons for peaceful purposes. Rajasthan Desert, Jaisalmer District.