Old clock in sand with the words: It Happend in August

What Happened in History: Browse Historical Facts on Kudos 365

Explore landmark events and cultural milestones throughout history on Kudos 365. Dates for earlier events may be approximate.

1949 CE, August 29

The Soviet Union secretly and successfully conducts its first weapon test, at the Semipalatinsk Test Site in Kazakhstan detonating its first atomic bomb code-named "First Lightning" (or RDS-1), and becoming the second nation to achieve nuclear warhead capability. The event marked the beginning of the nuclear arms race and heightened Cold War tensions between the two superpowers. The test was a surprise to the U.S., which had underestimated the speed of the Soviet atomic program.