How has the Mexican government become more democratic?

When it comes to Mexico and democracy within this country, there have been many changes during their existence since their independence in 1821. The reason México never established a long term democracy, is because there were many invasions and that made a country weaker than it should have been. Therefor, Mexico does not have a constant, stable constitution. The change was pretty solid back in the 1910 when the constitution of that year was established.