Question

which best explains how the institutional revolutionary party (pri) maintained power in mexico for many years?
it defeated opposition parties by controlling congress and using election fraud.
it ruled so well that people prospered and opposing parties did not succeed.
it acted like a dictatorship and jailed those who opposed the way they ruled.
it offered the working class many benefits and kept dissension to a minimum.

Explanation:

The Institutional Revolutionary Party (PRI) in Mexico maintained power for many years in part by controlling congress and using election - related tactics against opposition parties. It was not a case of exemplary rule leading to lack of opposition success, nor was it a straightforward dictatorship jailing opponents, and while it made some concessions to the working class, the main factor was its control over political institutions and electoral processes.

Answer:

It defeated opposition parties by controlling congress and using election fraud.