In mexico the expression porfiriato refers to
a. the oppressive rule of porfirio diaz
b. the end of the political dominance of the pri in july 2000
c. any kind of authoritarian political oppression
d. the revolution of 1911 that overthrew diaz

The word Porfiriato comes from the name "Porfirio", the first name of Porfirio Diaz - the President and de facto dictator of Mexico from 1884 to 1911. During this time he was re-elected president (sometimes through illegal means). Because he was the president for 30 years, many people spend a majority of their life under his rule, and it was an important period in Mexico's culture