And referring to all your sports competitions as World Championships when the only teams that play are American.

That’s literally only Baseball (and they did it for marketing,) and baseball happens to be the North American sport with the most popular international championship, the World Baseball Classic (actually I don’t know whether WBC or Olympic Hockey is more popular, but Hockey has a separate international championship from the Olympics.) The Football championship is called the Super Bowl, the Basketball championship is called the NBA Finals, the Hockey championship is called the Stanley Cup.