Where was the 1st PGA Championship held?

The first PGA Championship was held at Siwanoy Country Club in New York in 1916. This inaugural tournament was significant because it marked the beginning of what would become one of the major championships in professional golf. Siwanoy Country Club was chosen as the host site due to its location and suitability for the event, aligning with the PGA's goal to create a prestigious tournament that would showcase the top professional golfers of the time.

Other choices, while notable golf clubs, were not the site of the first PGA Championship. Garden City Golf Club, Shinnecock Hills Golf Club, and Oakmont Country Club have hosted various tournaments in the history of golf, but the first PGA Championship was specifically tied to the history and legacy of Siwanoy Country Club, making it the correct choice.