(I know I did a DBWI about a similar subject, but it kind of failed epically, so here goes...)
Let's say Newfoundland chooses responsible gov't in 1949? The country stays dirt poor, and maybe republican/left-wing movements prop up all over, including Pro-Soviet far-left movements. The Newfoundland Communist Party wins in let's say, the late 50's. Would the US just let this happen? Or would they initiate a Chile-style coup? After 1991, which side do the Newfies take?