Cika wannan jumla: Jam'iyyar ta samo asali ne kafin tarayyar Newfoundland tare da Kanada a matsayin Ƙungiyar Gwamnatin Responsible (RGL). RGL ta yi yakin neman gwamnati mai alhakin komawa Newfoundland, bayan an dakatar da ita a 1934. A cikin
1948 raba gardama, Newfoundland ya yi ƙuri'a kaɗan don shiga Kanada a matsayin lardinsa na goma. Bayan kuri'ar raba gardama, jam'iyyun tarayya sun fara shirya a Newfoundland kuma yawancin membobin RGL sun yanke shawarar daidaita kansu da Jam'iyyar Progressive Conservative ta Kanada, don kafa Jam'iyyar Progressive Conservative ta Newfoundland.