Groups are giving away flags to celebrate america's 250th birthday, with events taking place in various locations, including porter park in roscoe and greater boston. However, the celebration has also been marked by controversy, with some accusing a political figure of hijacking the event for personal gain and others marching with confederate flags. The significance of the celebration itself appears to be unclear to some, with a poll indicating that nearly half of americans are unsure what the occasion is commemorating.