Lets take a look at Panama's record
World Cup Record
1930 to 1934 Non-FIFA member
1938 to 1974 Did not enter
1978 to 2010 Did not qualify
Currently 5th out of 6th in their world cup qualification group.
Clearly a giant that the US has stunningly toppled, in a tournament played exclusively in the US.
World cup 2014 victor confirmed.
You forgot to add that they beat Mexico twice.