The correct answer is the last item: these countries have transitioned to democracy, and the United States has decreased aid to them.
Although the Cold War was mostly between the United States and Soviet Union in European, the Latin America’s Cold War experience is also well known. During the cold war, the United States provided funds for a lot of millitary movement in latin american countries to stop communist infuences in that region. After the fall of Soviet Union, the United States stopped providing aid to these countries.