No the Olive Baboons are not the only ones in all of North America... Safari Niagara has some I believe off the top of my head. They are the only troop left in the AZA to the best of my knowledge. Other places like research facilities, small zoos, sanctuaries, circuses, breeders, private collectors, ect probably have them.
In the AZA the only baboon species with an SSP is Hamadryas. Geladas which are not baboons but get called baboons are also kept at the Bronx and San Diego that I know of but they are not an SSP species.
In the AZA the only baboon species with an SSP is Hamadryas. Geladas which are not baboons but get called baboons are also kept at the Bronx and San Diego that I know of but they are not an SSP species.