You can not have one club representing itself in two or three different regions. A club can only exist and recruit in one region with a majority of each team in the club be made up of players from that region.
So the way around it is to setup a separate club in the other region with an independent board. CESA-Columbia was the first example of this and I believe Columbia United has now setup agreements with other clubs in other regions for the same purpose. The idea is to try and catch and consolidate the very top talent from one region to the home club in another region. Talent can be either players, coaches or parents to some degree. SC has limited top soccer talent and so the clubs have to be creative in finding and training that talent. The problem with having that separate club, is obvious. They are a separate club that if the wrong person(s), as far as the home club is concerned, got elected then that club could switch loyalty and there would be no legal recourse for the home club that started the club in the first place.
I do have very mixed feeling about this subject and have been on both sides of the coin. I understand the need and desire to consolidate the players to create a more competitive national team but I have seen the hurt and waste that is left behind when the consolidation happens. And soccer loses a lot of potential future advocates because of the need to have short term gains.