List the first name and birth date of all players from the country with code USA.
return players ;return countries of  #1 ;return code of  #2 ;return #1 where #3 is  USA ;return first names of  #4 ;return birth dates of  #4 ;return #5 ,  #6
['select', 'project', 'project', 'comparative', 'project', 'project', 'union']