FIFA includes
six continental governing bodies for association football,
says Wikipedia,
and one of those six bodies in FIFA is
the Confederation Of North [America],
Central America, and
Caribbean Association Football,
consisting of
the Guianas (in South America but considered Central America),
Central America (including the redoutable men's team from Mexico), and
North America (Canada, USA).

That puts CONCACAF on the same footing as
UEFA,
CONMEBOL,
OFC,
CAF, and
AFC,

all within FIFA.


And USMNT, I believe is supposed to mean
United States Men's National Team.
Hope that helps!