Chernobyl Disaster (1986)
On April 26, 1986, the No. 4 reactor in the Chernobyl Nuclear Power Plant exploded, causing the worst nuclear disaster in history. Chernobyl was one of two nuclear energy accidents rated a 7 out of 7 on the International Nuclear Event Scale. Over the following years, thousands have died from residual effects of the radiation.
Vietnam War (1955)
The Vietnam War, known as the American War in Vietnam, lasted from November 1, 1955, until April 30, 1975. The war's turning point was the Tet Offensive, a coordinated series of North Vietnamese attacks on over 100 cities and outposts in South Vietnam. Over 58,000 American soldiers were killed in the war.