看一下FIFA規則吧：

 

5. The ranking of each team in each group shall be determined as follows:
a) greatest number of points obtained in all group matches;
b) goal difference in all group matches;
c) greatest number of goals scored in all group matches.

If two or more teams are equal on the basis of the above three criteria, their rankings shall be determined as follows:

d) greatest number of points obtained in the group matches between the teams concerned;

e) goal difference resulting from the group matches between the teams concerned;

f) greater number of goals scored in all group matches between the teams concerned;

g) drawing of lots by the FIFA Organising Committee.

你說的情況，那美國和加納各得4分，然後再看b）。那麽goal  differential 美國累計就是0，加納累計就是+1。美國完戲。

這些規則裏麵沒有說牌牌啥的。