On October 24, 1931, the George Washington Bridge was dedicated, officially opening to traffic the next day. One of the world’s busiest bridges, the George Washington Bridge is also the world’s only 14-lane suspension bridge.
On October 1, 1940, the Pennsylvania Turnpike opened to drivers. Measuring 160-miles at the time of its opening, it’s considered the first superhighway in the US and helped inspire other state turnpikes and America’s Interstate Highway System.
On September 30, 1889, the first building of the Mayo Clinic opened to the public. Today its one of the world’s largest medical centers and the top-ranked hospital in the US.
On September 29, 1841, New York held the first state fair in the US. Today it’s the oldest and one of the most highly attended of all US state fairs.
On September 25, 1639, the first printing press in America was set up in Cambridge, Massachusetts Bay Colony. The press remained in continuous use for 150 years, printing some of the first books in the New World.
The American Association for the Advancement of Science (AAAS) was founded on September 20, 1848, in Philadelphia, Pennsylvania. It grew to become the world’s largest general scientific society with more than 120,000 members.
On September 4, 1882, Thomas Edison began providing electricity to a portion of New York City, an event often considered the start of the electrical age.
On August 20, 1920, Detroit’s 8MK radio station began daily broadcasts. Still in operation today, the station often claims to be the first commercial radio station, though a few others have also staked their claim on that title.
On August 12, 1918, the US Post Office Department took over control of airmail service from the US Army Air Service. Under the Post Office Department, the service flourished, leading to transcontinental airmail service, which was eventually taken over by private companies.