I'll try argentina after 1950:
1955: If this coup weren't succesful, Peron might have stayed in power and consolidated his regime. Maverick did a great TL based on a similar premise.
1956: This was a Peronist coup that failed IOTL who wanted to bring Perón back to power. If somehow it had been succesful (I don't see how) Perón might be called back home and reassumed power. This would likely produce a civil war, as Antiperonists wouldn't easily resign the power they had fought so long to get. Not a good scenario...
1962: If this coup had failed, there would definetely by another try. After all, there were many coup attemps before this one. But if, somehow, these attemps failed, and Frondizi finishes his term, this would be good for Argentina. Frondizi was a modernizer who wanted an open and capitalist Argentina, but one with a strong industry . He invested in oil, energy, ironworks and set up the base for our nuclear development program. If he had stayed he might have made an agreement with unions, legalize Peronism as a party (in some form), and set up the bases for a modern, industrialized and democratic Argentina
1966: If this coup had failed, this would have been good for the country. Of course, the UCR president Illia was attacked constantly both by Peronists unions and by the right-wing military, so it's likely he might have fallen anyways.
1976: If it had failed (I really don't see how), Isabel Probably would still resign. Yet, a scenario in which she resigns, a civilian transitional government assumes and new elections are called is allways better than what happened IOTL. No "dissapeared" (certainly not in the scale it happened IOTL), no Malvinas war in 1982; probably the guerilla movements would have survived beyond 1978/9, and might have lasted till the mid-eighties in some form or another...