The reagan doctrine assumed that political instability, especially in the third world, resulted from undemocratic regimes terrorist organizations influence of the soviet union attacks by contra rebels

The correct answer is influence of the soviet union

He beleived that the influence of the soviet union led to things like poverty and desperation and not any kind of internal factors. According to the doctrine, he believed that the US should help everyone get rid of Soviet influence. He funded numerous anti-communist rebels and contra groups worldwide, places like Asia, Latin America, and Africa.