what was the deadliest tornado to occur in the US where and when did it occur and how many people died

The Tri-State Tornado of March 18, 1925 killed 695 people in Missouri (11), Illinois (613), and Indiana (71). The outbreak it occurred with was also the deadliest known tornado outbreak, with a combined death toll of 747 across the Mississippi River Valley.

Explanation:

the tristate tornado

Explanation:

killed 695 people and injured 2,027 others in Southern Missouri, Illinois and Indiana in 1925. The tornado went on for 219 miles, making it the longest ever recorded.

this is math not biology xd

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