Adam Lanza shot and killed 20 children and 6 adults at the Sandy Hook Elementary School in Newtown, Connecticut.
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One of America's oldest documented highways was completed on this day in Connecticut, USA.
The first telephone directory was issued, which consisted of a single card with 50 names and addresses in Connecticut, USA.
Automatic street lights first appeared in New Milford, Connecticut, US.
Sandwich restaurant Subway was founded in Bridgeport, Connecticut, US.
The first ballistic missile submarine was launched from Groton, Connecticut, US.
