Why can China participate in the Copa America?

There are 12 teams participating in every America's Cup, while there are only 12 teams in South America, so the fixed South American Football Association will invite two teams from other continents to participate, while Mexico has been invited to participate for 12 years in a row. Originally, the other team invited in this competition was Japan, but the Japanese team refused, because there were too many teams in Europe to compete, so the South American Football Association refused.