Do you follow politics? It's very complicated sometimes. There are a lot of currents with different opinions. These arose in the period of the 19th century.
In this era, the voice of the people grew ever larger. This means that we can now demand that new elections be held.
In the era of the Industrial Revolution, the first factories were created. There were a lot of people working at low wages and in bad conditions.
History gives you many answers to questions about today's world. Does it even make sense that English is the most important language in the world?