which nations competed?
united states (usa), canada (can), jamaica (jam), cuba (cub), mexico (mex), brazil (bra), puerto rico (pur), colombia (col), peru (per), trinidad and tobago (tri), chile (chi), uruguay (uru), venezuela (ven)
how many gold medals did they win?
25, 5, 4, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0
and which nation won more than 20?
united states (usa)