What happened to the European map from 1837 to Pre world war I?

Four empires collapsed due to the war, old countries were abolished, new ones were formed, boundaries were redrawn, international organizations were established, and many new and old ideologies took a firm hold in people's minds.

Explanation:

During this time, empires such as the Russian Empire and the Austro-Hungarian empire both fell parts of the former empires were seperated into different countries and it redrew the continent of Europe as all these new countries were being formed, new borders were being formed also meaning that a new map had to be made for this purpose.

people can eat food during that time

the poor lived on the docks by the sea, and the wealthy lived in highly populated urban areas. that is the answer