what is the flagbearer of the united states at the 2011 pan american games and united states at the 2011 pan american games
SELECT DISTINCT var_uri where brack_open dbr_United_States_at_the_2011_Pan_American_Games dbp_flagbearer var_uri sep_dot dbr_United_States_at_the_2011_Pan_American_Games dbp_flagbearer var_uri brack_close