Well, it was more y'all that enforced our doctrine than we ever did.
But the real issue is that Liberia was set up in one of the worst possible locations in the world. It's hard enough just building a country there, much less expanding it to much of anything. Most of the "colonists" of the place either fled the country or died of the local diseases within a couple years of arriving.
It'd have been infinitely more successful planted almost any place less geographically convenient, like the Congo or Senegal or Namibia. Even superficially ridiculous locations like New Guinea or Alaska would have worked out better. To get a genuinely worse location, you really have to dump them in open desert, tundra, or taiga. Given that no one would have considered the latter, Liberia's location really was something of a worst-case scenario.