WikipediaThe 2021 CONCACAF Nations League Finals was the final tournament of the 2019–20 edition of the CONCACAF Nations League, the inaugural season of the international football competition involving the men's national teams of the member associations of CONCACAF. The tournament was held in the United...
https://en.wikipedia.org/wiki/2021_CONCACAF_Nations_League_Finals[https://en.m.wikipedia.org/wiki/2021_CONCACAF_Nations_League_Finals]
However other non-Concacaf teams can enter the Gold cup. For example Qatar is in the Gold cup this year.