Why was Mexico essentially a 1-party state from 1934-2000?

I am not denying that they were elections, and I am not denying that Mexico is a democracy and has been since 1934, but from 1934-2000, all of the presidents were from the Institutional Revolutionary Party. Why?
 

Caspian

Banned
I am not denying that they were elections, and I am not denying that Mexico is a democracy and has been since 1934, but from 1934-2000, all of the presidents were from the Institutional Revolutionary Party. Why?

Because the PRI was both very popular (at times) and rigged elections.
 
PRI rigged elections, controlled syndicates, repressed opposition, controlled the media, made alliances with the catholic church and drug dealers. It was and it's a party full of corruption and shameless self serving politicians (literally, EPN Plagiarized his university thesis and he doesn't care about it) the fait of México is constrained as long as the PRI exist.

Sorry I've got carried away.
 
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