When did cities in America begin offering 911 as an emergency alert tool?

The first North American emergency number was the 911 system deployed in Winnipeg, Manitoba, Canada in 1959 at the urging of Stephen Juba, mayor of Winnipeg at the time.

The first US 911 emergency phone systems went into use nine years later in Alabama, and Alaska in 1968. The first 911 call was made in Haleyville, Alabama on February 10, 1968. The second system, in Nome, Alaska was put into service later that same month. However, 911 systems were not in widespread use until the 1980s when the number 911 was adopted as the standard number across most of the country under the North American Numbering Plan.