question: List the first name and birth date of all players from the country with code USA.
#1 return players 
#2 return countries of  #1 
#3 return code of  #2 
#4 return #1 where #3 is  USA 
#5 return first names of  #4 
#6 return birth dates of  #4 
#7 return #5 ,  #6