5. 18 May 1980 Mount St Helens Washington USA
18 May 1980 was a disaster day for the people of Mount St. Helens when at 8:35 Sunday morning when volcanic eruptions shook Mount St. Helens very badly and scorched 230 square miles of forest. This deadliest eruption was one the worst incident happened in the USA as economy was badly hit by this incident.
More than 55 people were killed in this eruption but according to Government officials USA had faced the most economically destructive volcanic event in the history of the United States.