Usually when a professional sports league decides to expand and add a new team, early results are not great for the franchise. An expansion draft takes place, where the newly-added team gets to pick from a handful of players that the rest of league did not want to keep. This means low talent, which translates to low success. This has been true for virtually every single expansion team in any league in North America, with even average performances being triumphs.
However, that changed when the Vegas Golden Knights went to the NHL Stanley Cup in what would be the greatest inaugural season in sports history.