Given the extent of poverty and repressive governments in Latin America history

Given the extent of poverty and repressive governments in Latin America history

Given the extent of poverty and repressive governments in Latin America history, the number of attempted revolutions in the regions is not surprising. why have most of the revolutions failed ? what role should the united states play in future revolutions ? should the united states be involved in supporting or combating revolutions in Latin America ? if so, what criteria should be used to determine when the united states should be involved and on which used ? if not, why not ?