How would each of the the following present day democratic features increased the influence of the masses in the government in the late nineteenth century?

When World War I ended and drive a large number of democracies. But after sometimes between 1930s number of young democracies converted to an autocratic system. Furthermore, after World War II, many democracies started to grow again. But in 1989 found the number of increase in democracies that was because of the drop-down of Iron Curtain cira.

In the 20th century, democracy becomes the most powerful system, and more than half the world's population is living in a democracy. Moreover, most countries grow economically in the democratic system, because democracy has political freedom.