Why does the US have sporting events they call the World Series but never allow any other countries to enter?

We hear of these World Series events in the US but notice no other countries are invited to take part in these sporting competitions. It sounds like Americans trying to make themselves believe they are the top sports players in the world, but are not game to invite other teams from outside the country in case they... show more We hear of these World Series events in the US but notice no other countries are invited to take part in these sporting competitions. It sounds like Americans trying to make themselves believe they are the top sports players in the world, but are not game to invite other teams from outside the country in case they are beaten at their own country's sports.
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