https://www.history.com/this-day-in-history/great-chicago-fire-begins?cmpid=email-hist-tdih-2020- [login to see] 0&om_rid=
On October 8, 1871, flames spark in the Chicago barn of Patrick and Catherine O’Leary, igniting a two-day blaze that kills between 200 and 300 people, destroys 17,450 buildings, leaves 100,000 homeless and causes an estimated $200 million (in 1871 dollars; roughly $4 billion in 2020 dollars) in damages.