No hotel program has hotels everywhere.

According to this not-up-to-date* map:

http://www.awardmapper.com/

there was (whenever this map was put together) only one BW in all of Argentina, in (San Carlos de) Bariloche. Btw, I stayed there a couple times while visiting that area. In Buenos Aires, on one stay i used Hilton HHonors and on another stay I used IHG for a Holiday Inn Express.

* In Netherlands this Award Mapper map shows several hotels which left the BW program prior to this year (not sure just how long ago), and in Alaska it doesn't show the BW in Seward (not sure when it joined), and in Venice it shows a Choice hotel that left the Choice program a couple years ago. So that's how I know it's out of date, but I haven't been able to figure out exactly when it was created or last updated.