1979 Mexican Legislative Election
First with proportional seats1979 · Midterms under the hegemonic party
They were the first national elections held after the approval of the political reforms of 1977, which allowed the Mexican Communist Party, Mexican Democratic Party and the Workers' Socialist Party to obtain legal registration and compete in elections for the first time, as well as increasing the size of the Chamber of Deputies from 237 seats to 400.
A midterm held under the hegemonic-party system: the official majority was not in genuine doubt.
President before
José López Portillo
PRI
President (continued)
José López Portillo
PRI
Largest force
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Turnout
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The surviving record for this contest does not include a party-by-party results table; the story above is what the sources support.