The administration billed Tuesday’s trip as a celebration of the completion of 200 miles of new wall system. But the 200 miles are only a portion of the administration’s goal to build 450 miles by the end of this year. Of those, roughly three miles have been constructed in areas where no barriers previously existed while the majority of miles replaced old, outdated designs with an enhanced system, according to US Customs and Border Protection, which oversees border wall construction.