The Little Boy bomb dropped on Hiroshima, Japan on August 6, 1942.
The Tuskegee airmen became the first group of African American pilots.
Thailand
The first prototypes were made in June 1941-May 1942.Mass production of the tiger started in August 1942.The first Tigers were used in combat in September 1942.
A plan for the Western allies to open the second front in France in 1942.
Nuclear explosions are not controlled. Nuclear reactors are controlled.The first controlled nuclear reaction in the US was on December 2, 1942.The first nuclear explosion in the US was on July 16, 1945.
The nuclear fusion was first experimentally achieved in 1934 ( by Enrico Fermi).
Chernobyl Nuclear Disaster - April 26, 1986. Three Mile Island Nuclear Generating Station Accident - March 28, 1979 First man-made nuclear reactor that reached criticality - December 2, 1942 (Manhattan Project) Nuclear reactor first used for electricity - December 20, 1951
The first nuclear reactor was in former Soviet Union that operated in year 1954 at obninisk.
1942
Belzec was in operation from March-December, 1942. In that short period 434,508 Jews were killed there and an unknown number of gypsies.
In 1942, Chicago
Enrico Fermi, 1942
December 22. Source: I consulted timeanddate.com and showed all religious observances for 1943.
i think that you may mean the Manhattan project, which was to build the first nuclear bomb back in 1942.
On Dec 2nd, 1942, on a racquet court that was below the bleachers of Stagg Field at the University of Chicago, a nuclear reaction was shown for the first time.
Chicago, 1942