When did the Manhattan Project begin?
194220th century · 1900s
The Manhattan Project begins.
It built the first atomic bombs in about three years.
1942
150016001700180019002000
Around the same time
- When did World War II begin?1939
- When did Gone with the Wind premiere?1939
- When did the first McDonald's restaurant open?1940
- When was Mount Rushmore completed?1941
- When did Japan attack Pearl Harbor?1941
- When was D-Day, the Allied landing in Normandy?1944
- When was the microwave oven invented?1945
- When was the United Nations founded?1945
Some events played out over months or years, so we use the year they are best known for. Spotted a mistake? Email [email protected].