B) ¿Durante cuántas décadas ha tenido vigencia la Constitución
de 1917?

The Constitution of 1917, still in force almost 100 years later, has 137 articles. These define citizenship, organize a government, mandate land reform, and enumerate basic human rights for all Mexicans.  

Or in English, the Constitution of 1917, still in force almost 100 years later, has 137 articles. These define citizenship, organize a government, mandate land reform, and enumerate basic human rights for all Mexicans.

- Atargatis Jones

"the royal proclamation of 1763"