premise: The 1919 PGA Championship was the second PGA Championship, which is now considered one of golf's major championships. It was held September 16–20 at the Engineers Country Club in Roslyn Harbor, New York, east of New York City on Long Island in Nassau County.
hypothesis: The 1919 PGA Championship had other championships come after it. 
reason: It said that the PGA championship is now one of the major ones.... which means that there were definitely more of these that came after it. From the passage, we know this has to be true. 