I'm reasonably certain "Join or Die with Craig Ferguson" is cancelled.
1. The show was renewed for a second season and this was publicly announced.
2. The final episode of the 1st season ("History's Biggest Douchebag" -- the show is a debate panel show about questions through history) did not air, with no advance warning
3. Since then, Craig Ferguson has not mentioned the show, promoted the show, acknowledged the show, etc. He just did Chelsea on Netflix to promote Celebrity Name Game, but no mention of Join or Die. Nothing in his Twitter bio about it.
4. Social media for the show has been dormant since then, except to say "We're not sure when Join or Die will come back." in four tweets. Nothing on Facebook. And it was very active during the season.
5. Got removed from "Most Popular Shows" on the History website shortly after the season ended
If I had to guess--and this is based on literally nothing except my own idle speculation--I'd say that the final episode got pulled over content issues (maybe because someone living was in the running of the title question?) and Craig quit because of that, because the show uses Craig's name and he EPed and developed it, the network can't replace him as host.