In the 19th century there were [?] social classes divided according to the money each class had.
The wealthiest were the [?] class, and they were formed by the bourgeoise.
The [?] class, also known as the [?] and between these two groups, there was a [?] class.
There were [?] advances such as [?], technical advances in [?], so there was a population explosion.
Citizens demanded [?] and factory workers demanded decent wotking and living conditions.
The labour movement organised many [?] and protest.