From the AP:
Argentine midfielder Marcelo Gallardo signed with D.C. United on Monday, the biggest of five South American additions to the club within the past week.
The team also added Peruvian goalkeeper Jose Carvallo and Argentine defender Gonzalo Peralta on Monday as the team held its first preseason practice.
...
Gallardo recently left French club Paris Saint Germain, where he was unhappy with his playing time.
The 21-year-old Carvallo was playing with Universitario de Deportes in Peru's first division, while the 27-year-old Peralta was with Club Almirante Brown in Argentina's second division.
Carvallo has a U.S. green card so he will not count as an international player. Peralta is awaiting a work visa.
Last week, United signed signing Colombian defender Gonzalo Martinez and obtained Argentine forward Franco Niell on a one-year loan from the Argentinos Junior club.
You can't tell the players without a world map.