What has been the main obstacle to democratic reform in latin american nations? strong military regimes non-revolutionary, non-democratic traditions involvement in foreign wars rebellion among indigenous populations

An obstacle to democratic reform in Latin American Nations, among the years, has been:

1. Strong military regimes.

Many countries were under military dictatorships between 1950s  and 1980s, and a few like Cuba and Venzuela still are. Democracy then has been difficult to restore, plus several economic and political crisis due to goverment corruption.  

the answer is b for brother